W681512 SINGLE-CHANNEL VOICEBAND CODEC Data Sheet -1- Publication Release Date: September, 2007 Revision C14 W681512 1. GENERAL DESCRIPTION The W681512 is a general-purpose single channel PCM CODEC with pin-selectable μ-Law or A-Law companding. The device is compliant with the ITU G.712 specification. It operates from a single +5V power supply and is available in 20-pin SOG (SOP), SSOP and TSSOP package. Functions performed include digitization and reconstruction of voice signals, and band limiting and smoothing filters required for PCM systems. The filters are compliant with ITU G.712 specification. W681512 performance is specified over the industrial temperature range of –40°C to +85°C. The W681512 includes an on-chip precision voltage reference and an additional power amplifier, capable of driving 300Ω loads differentially up to a level of 6.3V peak-to-peak. The analog section is fully differential, reducing noise and improving the power supply rejection ratio. The data transfer protocol supports both long-frame and short-frame synchronous communications for PCM applications, and IDL and GCI communications for ISDN applications. W681512 accepts seven master clock rates between 256 kHz and 4.096 MHz, and an on-chip pre-scaler automatically determines the division ratio for the required internal clock. ApplIcations 2. FEATURES • VoIP, Voice over Networks equipment • Single +5V power supply • • Typical power dissipation of 30 mW, power-down mode of 0.5 μW Digital telephone and communication systems • Wireless Voice devices • Fully-differential analog circuit design and output signals • DECT/Digital Cordless phones • Differential Analog Outputs • Broadband Access Equipment • On-chip precision reference of 1.575 V for a 0 dBm TLP at 600 Ω (775mVRMS) • Bluetooth Headsets • Fiber-to-curb equipment • Push-pull power amplifiers with external gain adjustment with 300 Ω load capability • Enterprise phones • Digital Voice Recorders • Seven master clock rates of 256 kHz to 4.096 MHz • Pin-selectable μ-Law and A-Law companding (compliant with ITU G.711) • CODEC A/D and D/A filtering compliant with ITU G.712 • Industrial temperature range (–40°C to +85°C) • Packages: 20-pin SOG (SOP), SSOP and TSSOP • Pb-Free package options available -2- W681512 3. BLOCK DIAGRAM Re Int PC cei erf M ve ace Receive PCM Interface BCLKR FSR PCMR G.712 CODEC G.711 μ/A -Law Tra Int ns PC erf mitM ace Transmit PCM Interface BCLKT FST PCMT PAO+ PAOPAI RORO+ RO AO AI+ AIμ/A-Law 512 kHz 256 kHz Voltage reference V AG 8 kHz PUI Power Conditioning VDD 256 kHz, 512 kHz, 1536 kHz, 1544 kHz, 2048 kHz, 2560 kHz & 4096 kHz Pre -Scaler scaler VSS MCLK -3- Publication Release Date: April, 2007 Revision C14 W681512 4. TABLE OF CONTENTS 1. GENERAL DESCRIPTION.................................................................................................................. 2 2. FEATURES ......................................................................................................................................... 2 3. BLOCK DIAGRAM .............................................................................................................................. 3 4. TABLE OF CONTENTS ...................................................................................................................... 4 5. PIN CONFIGURATION ....................................................................................................................... 6 6. PIN DESCRIPTION ............................................................................................................................. 7 7. FUNCTIONAL DESCRIPTION............................................................................................................ 8 7.1. Transmit Path ................................................................................................................................ 8 7.2. Receive Path ................................................................................................................................. 9 7.3. Power Management..................................................................................................................... 10 7.3.1. Analog and Digital Supply ..................................................................................................... 10 7.3.2. Analog Ground Reference Voltage Output ...........................................................................10 7.4. PCM Interface .............................................................................................................................. 10 7.4.1. Long Frame Sync.................................................................................................................. 10 7.4.2. Short Frame Sync ................................................................................................................. 11 7.4.3. General Circuit Interface (GCI) ............................................................................................. 11 7.4.4. Interchip Digital Link (IDL)..................................................................................................... 12 7.4.5. System Timing ...................................................................................................................... 12 8. TIMING DIAGRAMS.......................................................................................................................... 13 9. ABSOLUTE MAXIMUM RATINGS.................................................................................................... 20 9.1. Absolute Maximum Ratings ......................................................................................................... 20 9.2. Operating Conditions ................................................................................................................... 20 10. ELECTRICAL CHARACTERISTICS ............................................................................................... 21 10.1. General Parameters .................................................................................................................. 21 10.2. Analog Signal Level and Gain Parameters ...............................................................................22 10.3. Analog Distortion and Noise Parameters ..................................................................................23 10.4. Analog Input and Output Amplifier Parameters.........................................................................24 10.5. Digital I/O ................................................................................................................................... 26 10.5.1. μ-Law Encode Decode Characteristics...............................................................................26 10.5.2. A-Law Encode Decode Characteristics ..............................................................................27 10.5.3. PCM Codes for Zero and Full Scale ...................................................................................28 10.5.4. PCM Codes for 0dBm0 Output ...........................................................................................28 11. TYPICAL APPLICATION CIRCUIT ................................................................................................. 29 12. PACKAGE SPECIFICATION .......................................................................................................... 31 12.1. 20L SOG (SOP)-300mil ............................................................................................................. 31 -4- W681512 12.2. 20L SSOP-209 mil ..................................................................................................................... 33 12.3. 20L TSSOP - 4.4X6.5mm .......................................................................................................... 35 13. ORDERING INFORMATION........................................................................................................... 36 14. VERSION HISTORY ....................................................................................................................... 37 -5- Publication Release Date: April, 2007 Revision C14 W681512 5. PIN CONFIGURATION RO+ ROPAI PAOPAO+ VDD FSR PCMR BCLKR PUI 1 20 2 19 3 18 4 17 5 6 7 SINGLE CHANNEL CODEC 16 15 14 8 13 9 12 10 11 SOG/SSOP/TSSOP -6- VAG AI+ AIAO /A μ/A-Law VSS FST PCMT BCLKT MCLK W681512 6. PIN DESCRIPTION Pin Name Pin No. Functionality RO+ 1 Non-inverting output of the receive smoothing filter. This pin can typically drive a 2 kΩ load to 1.575 volt peak referenced to the analog ground level. RO- 2 Inverting output of the receive smoothing filter. This pin can typically drive a 2 kΩ load to 1.575 volt peak referenced to the analog ground level. PAI 3 This pin is the inverting input to the power amplifier. Its DC level is at the VAG voltage. PAO- 4 Inverting power amplifier output. This pin can drive a 300 Ω load to 1.575 volt peak referenced to the VAG voltage level. PAO+ 5 Non-inverting power amplifier output. This pin can drive a 300 Ω load to 1.575 volt peak referenced to the VAG voltage level. VDD 6 Power supply. This pin should be decoupled to VSS with a 0.1μF ceramic capacitor. FSR 7 8 kHz Frame Sync input for the PCM receive section. This pin also selects channel 0 or channel 1 in the GCI and IDL modes. It can also be connected to the FST pin when transmit and receive are synchronous operations. PCMR 8 PCM input data receive pin. The data needs to be synchronous with the FSR and BCLKR pins. BCLKR 9 PCM receive bit clock input pin. This pin also selects the interface mode. The GCI mode is selected when this pin is tied to VSS. The IDL mode is selected when this pin is tied to VDD. This pin can also be tied to the BCLKT when transmit and receive are synchronous operations. PUI 10 Power up input signal. When this pin is tied to VDD, the part is powered up. When tied to VSS, the part is powered down. MCLK 11 System master clock input. Possible input frequencies are 256 kHz, 512 kHz, 1536 kHz, 1544 kHz, 2048 kHz, 2560 kHz & 4096 kHz. For a better performance, it is recommended to have the MCLK signal synchronous and aligned to the FST signal. This is a requirement in the case of 256 and 512 kHz frequency. BCLKT 12 PCM transmit bit clock input pin. PCMT 13 PCM output data transmit pin. The output data is synchronous with the FST and BCLKT pins. FST 14 8 kHz transmit frame sync input. This pin synchronizes the transmit data bytes. VSS 15 This is the supply ground. This pin should be connected to 0V. μ/A-Law 16 Compander mode select pin. μ-Law companding is selected when this pin is tied to VDD. A-Law companding is selected when this pin is tied to VSS. AO 17 Analog output of the first gain stage in the transmit path. AI- 18 Inverting input of the first gain stage in the transmit path. AI+ 19 Non-inverting input of the first gain stage in the transmit path. VAG 20 Mid-Supply analog ground pin, which supplies a 2.4 Volt reference voltage for all-analog signal processing. This pin should be decoupled to VSS with a 0.01μF to 0.1 μF capacitor. This pin becomes high impedance when the chip is powered down. -7- Publication Release Date: April, 2007 Revision C14 W681512 7. FUNCTIONAL DESCRIPTION W681512 is a single-rail, single channel PCM CODEC for voiceband applications. The CODEC complies with the specifications of the ITU-T G.712 recommendation. The CODEC also includes a complete μ-Law and A-Law compander. The μ-Law and A-Law companders are designed to comply with the specifications of the ITU-T G.711 recommendation. The block diagram in section 3 shows the main components of the W681512. The chip consists of a PCM interface, which can process long and short frame sync formats, as well as GCI and IDL formats. The pre-scaler of the chip provides the internal clock signals and synchronizes the CODEC sample rate with the external frame sync frequency. The power conditioning block provides the internal power supply for the digital and the analog section, while the voltage reference block provides a precision analog ground voltage for the analog signal processing. The main CODEC block diagram is shown in section 3. VA V AG G + - - + Receive Path PAO+ PAO PAI 8 μ/A-Contr Control ol D/A + RO + Converter w - RO - fC= 3400Hz Hz Smoothi Smoothing n Filter 1 Smoothing Smoothi n Filter 2 Transmit Path AO 8 A/D Converter μ μ/A- /A Control Contr ffCC == 200Hz 200 Hz Pass High High Filte Filter Pas ++ - fC== 3400Hz 3400 Hz AntAliasing Ant -Aliasi i Filter n AI+ AI - Ant-Aliasi Ant-Aliasing Filter Figure 7.1 The W681512 Signal Path 7.1. Transmit Path The A-to-D path of the CODEC contains an analog input amplifier with externally configurable gain setting (see application examples in section 11). The device has an input operational amplifier whose output is the input to the encoder section. If the input amplifier is not required for operation it can be powered down and bypassed. In that case a single ended input signal can be applied to the AO pin or the AI- pin. The AO pin becomes high input impedance when the input amplifier is powered down. The input amplifier can be powered down by connecting the AI+ pin to VDD or VSS. The AO pin is selected -8- W681512 as an input when AI+ is tied to VDD and the AI- pin is selected as an input when AI+ is tied to VSS (see Table 7.1). AI+ Input Amplifier Input VDD Powered Down AO 1.2 to VDD-1.2 Powered Up AI+, AI- VSS Powered Down AI- Table 7.1 Input Amplifier Modes of operation When the input amplifier is powered down, the input signal at AO or AI- needs to be referenced to the analog ground voltage VAG. The output of the input amplifier is fed through a low-pass filter to prevent aliasing at the switched capacitor 3.4 kHz low pass filter. The 3.4 kHz switched capacitor low pass filter prevents aliasing of input signals above 4 kHz, due to the sampling at 8 kHz. The output of the 3.4 kHz low pass filter is filtered by a high pass filter with a 200 Hz cut-off frequency. The filters are designed according to the recommendations in the G.712 ITU-T specification. From the output of the high pass filter the signal is digitized. The signal is converted into a compressed 8-bit digital representation with either μ-Law or ALaw format. The μ-Law or A-Law format is pin-selectable through the μ/A-Law pin. The compression format can be selected according to Table 7.2. μ/A-Law Pin Format VSS A-Law VDD μ-Law Table 7.2. Pin-selectable Compression Format The digital 8-bit μ-Law or A-Law samples are fed to the PCM interface for serial transmission at the data rate supplied by the external BCLKT. 7.2. Receive Path The 8-bit digital input samples for the D-to-A path are serially shifted in by the PCM interface and converted to parallel data bits. During every cycle of the frame sync FSR, the parallel data bits are fed through the pin-selectable μ-Law or A-Law expander and converted to analog samples. The mode of expansion is selected by the μ/A-Law pin as shown in Table 7.2. The analog samples are filtered by a low-pass smoothing filter with a 3.4 kHz cut-off frequency, according to the ITU-T G.712 specification. A sin(x)/x compensation is integrated with the low pass smoothing filter. The output of this filter is buffered to provide the differential receive output signals RO+ and RO-. The RO+ or RO- outputs can be externally connected to the PAI pin to provide a differential output with high driving capability at the PAO+ and PAO- pins. By using external resistors (see section 11 for examples), various gain settings -9- Publication Release Date: April, 2007 Revision C14 W681512 of this output amplifier can be achieved. If the transmit power amplifier is not in use, it can be powered down by connecting PAI to VDD. 7.3. POWER MANAGEMENT 7.3.1. Analog and Digital Supply The power supply for the analog and digital parts of the W681512 must be 5V +/- 10%. This supply voltage is connected to the VDD pin. The VDD pin needs to be decoupled to ground through a 0.1 μF ceramic capacitor. 7.3.2. Analog Ground Reference Voltage Output The analog ground reference voltage is available for external reference at the VAG pin. This voltage needs to be decoupled to VSS through a 0.01 μF to a 0.1 μF ceramic capacitor. 7.4. PCM INTERFACE The PCM interface is controlled by pins BCLKR, FSR, BCLKT & FST. The input data is received through the PCMR pin and the output data is transmitted through the PCMT pin. The modes of operation of the interface are shown in Table 7.3. BCLKR FSR Interface Mode 64 kHz to 4.096 MHz 8 kHz Long or Short Frame Sync VSS VSS ISDN GCI with active channel B1 VSS VDD ISDN GCI with active channel B2 VDD VSS ISDN IDL with active channel B1 VDD VDD ISDN IDL with active channel B2 Table 7.3 PCM Interface mode selections 7.4.1. Long Frame Sync The Long Frame Sync or Short Frame Sync interface mode can be selected by connecting the BCLKR or BCLKT pin to a 64 kHz to 4.096 MHz clock and connecting the FSR or FST pin to the 8 kHz frame sync. The device synchronizes the data word for the PCM interface and the CODEC sample rate on the positive edge of the Frame Sync signal. It recognizes a Long Frame Sync when the FST pin is held HIGH for two consecutive falling edges of the bit-clock at the BCLKT pin. The length of the Frame Sync pulse can vary from frame to frame, as long as the positive frame sync edge occurs every 125 μsec. During data transmission in the Long Frame Sync mode, the transmit data pin - 10 - W681512 PCMT will become low impedance when the Frame Sync signal FST is HIGH or when the 8 bit data word is being transmitted. The transmit data pin PCMT will become high impedance when the Frame Sync signal FST becomes LOW while the data is transmitted or when half of the LSB is transmitted. The internal decision logic will determine whether the next frame sync is a long or a short frame sync, based on the previous frame sync pulse. To avoid bus collisions, the PCMT pin will be high impedance for two frame sync cycles after every power down state. More detailed timing information can be found in the interface timing section. 7.4.2. Short Frame Sync The W681512 operates in the Short Frame Sync Mode when the Frame Sync signal at pin FST is HIGH for one and only one falling edge of the bit-clock at the BCLKT pin. On the following rising edge of the bit-clock, the W681512 starts clocking out the data on the PCMT pin, which will also change from high to low impedance state. The data transmit pin PCMT will go back to the high impedance state halfway through the LSB. The Short Frame Sync operation of the W681512 is based on an 8-bit data word. When receiving data on the PCMR pin, the data is clocked in on the first falling edge after the falling edge that coincides with the Frame Sync signal. The internal decision logic will determine whether the next frame sync is a long or a short frame sync, based on the previous frame sync pulse. To avoid bus collisions, the PCMT pin will be high impedance for two frame sync cycles after every power down state. More detailed timing information can be found in the interface timing section. 7.4.3. General Circuit Interface (GCI) The GCI interface mode is selected when the BCLKR pin is connected to VSS for two or more frame sync cycles. It can be used as a 2B+D timing interface in an ISDN application. The GCI interface consists of 4 pins : FSC (FST), DCL (BCLKT), Dout (PCMT) & Din (PCMR). The FSR pin selects channel B1 or B2 for transmit and receive. Data transitions occur on the positive edges of the data clock DCL. The Frame Sync positive edge is aligned with the positive edge of the data clock DCLK. The data rate is running half the speed of the bit-clock. The channels B1 and B2 are transmitted consecutively. Therefore, channel B1 is transmitted on the first 16 clock cycles of DCL and B2 is transmitted on the second 16 clock cycles of DCL. For more timing information, see the timing section. - 11 - Publication Release Date: April, 2007 Revision C14 W681512 7.4.4. Interchip Digital Link (IDL) The IDL interface mode is selected when the BCLKR pin is connected to VDD for two or more frame sync cycles. It can be used as a 2B+D timing interface in an ISDN application. The IDL interface consists of 4 pins : IDL SYNC (FST), IDL CLK (BCLKT), IDL TX (PCMT) & IDL RX (PCMR). The FSR pin selects channel B1 or B2 for transmit and receive. The data for channel B1 is transmitted on the first positive edge of the IDL CLK after the IDL SYNC pulse. The IDL SYNC pulse is one IDL CLK cycle long. The data for channel B2 is transmitted on the eleventh positive edge of the IDL CLK after the IDL SYNC pulse. The data for channel B1 is received on the first negative edge of the IDL CLK after the IDL SYNC pulse. The data for channel B2 is received on the eleventh negative edge of the IDL CLK after the IDL SYNC pulse. The transmit signal pin IDL TX becomes high impedance when not used for data transmission and also in the time slot of the unused channel. For more timing information, see the timing section. 7.4.5. System Timing The system can work at 256 kHz, 512 kHz, 1536 kHz, 1544 kHz, 2048 kHz, 2560 kHz & 4096 kHz master clock rates. The system clock is supplied through the master clock input MCLK and can be derived from the bit-clock if desired. An internal pre-scaler is used to generate a fixed 256 kHz and 8 kHz sample clock for the internal CODEC. The pre-scaler measures the master clock frequency versus the Frame Sync frequency and sets the division ratio accordingly. If the Frame Sync is LOW for the entire frame sync period while the MCLK and BCLK pin clock signals are still present, the W681512 will enter the low power standby mode. Another way to power down is to set the PUI pin to LOW. When the system needs to be powered up again, the PUI pin needs to be set to HIGH and the Frame Sync pulse needs to be present. It will take two Frame Sync cycles before the pin PCMT will become low impedance. - 12 - W681512 8. TIMING DIAGRAMS TFTRHM TFTRSM TMCKL TMCKH TRISE TFALL MCLK TMCK TFS TFSL FST TFTRH BCLKT 0 TFTRS 1 TFTFH 2 3 TFDTD TBCKH 4 5 6 7 TBDTD PCMT D7 D6 8 0 D4 D3 D2 1 TBCK THID THID D5 TBCKL D1 D0 MSB LSB TFS TFSL FSR TFRRH BCLKR 0 TFRRS 1 TFRFH 2 3 TBCKH 4 5 6 7 8 TBCKL 0 1 TBCK PCMR D7 MSB TDRS D6 D5 D4 D3 D2 D1 D0 LSB TDRH Figure 8.1 Long Frame Sync PCM Timing - 13 - Publication Release Date: April, 2007 Revision C14 W681512 SYMBOL DESCRIPTION 1/TFS FST, FSR Frequency 1 MIN TYP MAX --- 8 --- TBCK UNIT kHz TFSL FST / FSR Minimum LOW Width sec 1/TBCK BCLKT, BCLKR Frequency 64 --- 4096 TBCKH BCLKT, BCLKR HIGH Pulse Width 50 --- --- ns TBCKL BCLKT, BCLKR LOW Pulse Width 50 --- --- ns TFTRH BCLKT 0 Falling Edge to FST Rising Edge Hold Time 20 --- --- ns TFTRS FST Rising Edge to BCLKT 1 Falling edge Setup Time 80 --- --- ns TFTFH BCLKT 2 Falling Edge to FST Falling Edge Hold Time 50 --- --- ns TFDTD FST Rising Edge to Valid PCMT Delay Time --- --- 60 ns TBDTD BCLKT Rising Edge to Valid PCMT Delay Time --- --- 60 ns THID Delay Time from the Later of FST Falling Edge, or 10 --- 60 ns kHz BCLKT 8 Falling Edge to PCMT Output High Impedance TFRRH BCLKR 0 Falling Edge to FSR Rising Edge Hold Time 20 --- --- ns TFRRS FSR Rising Edge to BCLKR 1 Falling edge Setup Time 80 --- --- ns TFRFH BCLKR 2 Falling Edge to FSR Falling Edge Hold Time 50 --- --- ns TDRS Valid PCMR to BCLKR Falling Edge Setup Time 0 --- --- ns TDRH PCMR Hold Time from BCLKR Falling Edge 50 --- --- ns Table 8.1 Long Frame Sync PCM Timing Parameters 1 TFSL must be at least ≥ TBCK - 14 - W681512 TFTRHM TFTRSM TMCKL TMCKH TRISE TFALL MCLK TMCK TFS TFTFH TFTFS FST TFTRS TFTRH BCLKT -1 0 TBCKH 1 2 3 TBDTD D7 PCMT 4 5 6 7 0 8 TBDTD D6 D5 TBCKL TBCK THID D4 D3 D2 1 D1 D0 MSB LSB TFS TFRFH TFRFS FSR TFRRS TFRRH BCLKR -1 0 TBCKH 1 2 3 4 5 6 7 TBCKL 0 8 1 TBCK PCMR D7 MSB TDRS D6 D5 D4 D3 D2 D1 D0 LSB TDRH Figure 8.2 Short Frame Sync PCM Timing - 15 - Publication Release Date: April, 2007 Revision C14 W681512 SYMBOL DESCRIPTION MIN TYP MAX 1/TFS FST, FSR Frequency --- 8 --- kHz 1/TBCK BCLKT, BCLKR Frequency 64 --- 4096 kHz TBCKH BCLKT, BCLKR HIGH Pulse Width 50 --- --- ns TBCKL BCLKT, BCLKR LOW Pulse Width 50 --- --- ns TFTRH BCLKT –1 Falling Edge to FST Rising Edge Hold Time 20 --- --- ns TFTRS FST Rising Edge to BCLKT 0 Falling edge Setup Time 80 --- --- ns TFTFH BCLKT 0 Falling Edge to FST Falling Edge Hold Time 50 --- --- ns TFTFS FST Falling Edge to BCLKT 1 Falling Edge Setup Time 50 --- --- ns TBDTD BCLKT Rising Edge to Valid PCMT Delay Time 10 --- 60 ns THID Delay Time from BCLKT 8 Falling Edge to PCMT Output High Impedance 10 --- 60 ns TFRRH BCLKR –1 Falling Edge to FSR Rising Edge Hold Time 20 --- --- ns TFRRS FSR Rising Edge to BCLKR 0 Falling edge Setup Time 80 --- --- ns TFRFH BCLKR 0 Falling Edge to FSR Falling Edge Hold Time 50 --- --- ns TFRFS FSR Falling Edge to BCLKR 1 Falling Edge Setup Time 50 --- --- ns TDRS Valid PCMR to BCLKR Falling Edge Setup Time 0 --- --- ns TDRH PCMR Hold Time from BCLKR Falling Edge 50 --- --- ns Table 8.2 Short Frame Sync PCM Timing Parameters - 16 - UNIT W681512 TFS FST TFSFH TFSRS TFSRH BCLKT -1 0 1 TBCKH 2 3 4 5 TBDTD PCMT 6 8 9 THID TBDTD D7 D6 D5 D4 D3 D2 D1 D0 MSB LSB TDRS PCMR 7 10 11 12 LSB 15 16 17 18 TBCK THID TBDTD D7 D6 D5 D4 D3 D2 D1 D0 LSB MSB TDRS D7 D6 D5 D4 D3 D2 D1 D0 14 TBDTD TDRH MSB 13 TBCKL TDRH D7 D6 D5 D4 D3 D2 MSB BCH = 0 B1 Channel D1 D0 LSB BCH = 1 B2 Channel Figure 8.3 IDL PCM Timing SYMBOL DESCRIPTION MIN TYP MAX UNIT 1/TFS FST Frequency --- 8 --- kHz 1/TBCK BCLKT Frequency 256 --- 4096 kHz TBCKH BCLKT HIGH Pulse Width 50 --- --- ns TBCKL BCLKT LOW Pulse Width 50 --- --- ns TFSRH BCLKT –1 Falling Edge to FST Rising Edge Hold Time 20 --- --- ns TFSRS FST Rising Edge to BCLKT 0 Falling edge Setup Time 60 --- --- ns TFSFH BCLKT 0 Falling Edge to FST Falling Edge Hold Time 20 --- --- ns TBDTD BCLKT Rising Edge to Valid PCMT Delay Time 10 --- 60 ns THID Delay Time from the BCLKT 8 Falling Edge (B1 channel) or BCLKT 18 Falling Edge (B2 Channel) to PCMT Output High Impedance 10 --- 50 ns TDRS Valid PCMR to BCLKT Falling Edge Setup Time 20 --- --- ns TDRH PCMR Hold Time from BCLKT Falling Edge 75 --- --- ns Table 8.3 IDL PCM Timing Parameters - 17 - Publication Release Date: April, 2007 Revision C14 W681512 TFS FST TFSFH TFSRS TFSRH TBCKH TBCKL BCLKT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 TFDTD PCMT TBDTD TBDTD D7 D6 D5 D4 D3 D2 D1 D0 TDRS D7 D6 D5 D4 D3 D2 D1 D0 LSB TDRS TDRH TDRH D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 MSB THID TBDTD TBCK LSB MSB MSB PCMR THID D1 D0 LSB LSB MSB BCH = 0 B1 Channel BCH = 1 B2 Channel Figure 8.4 GCI PCM Timing SYMBOL DESCRIPTION MIN TYP MAX 1/TFST FST Frequency 1/TBCK --- 8 --- kHz BCLKT Frequency 512 --- 6176 kHz TBCKH BCLKT HIGH Pulse Width 50 --- --- ns TBCKL BCLKT LOW Pulse Width 50 --- --- ns TFSRH BCLKT 0 Falling Edge to FST Rising Edge Hold Time 20 --- --- ns TFSRS FST Rising Edge to BCLKT 1 Falling edge Setup Time 60 --- --- ns TFSFH BCLKT 1 Falling Edge to FST Falling Edge Hold Time 20 --- --- ns TFDTD FST Rising Edge to Valid PCMT Delay Time --- --- 60 ns TBDTD BCLKT Rising Edge to Valid PCMT Delay Time --- --- 60 ns THID Delay Time from the BCLKT 16 Falling Edge (B1 channel) or BCLKT 32 Falling Edge (B2 Channel) to PCMT Output High Impedance 10 --- 50 ns TDRS Valid PCMR to BCLKT Rising Edge Setup Time 20 --- --- ns TDRH PCMR Hold Time from BCLKT Rising Edge --- --- 60 ns Table 8.4 GCI PCM Timing Parameters - 18 - UNIT W681512 SYMBOL DESCRIPTION 1/TMCK Master Clock Frequency TYP MIN --- 256 MAX --- UNIT kHz 512 1536 1544 2048 2560 4096 TMCKH / TMCK MCLK Duty Cycle for 256 kHz Operation 45% TMCKH Minimum Pulse Width HIGH for MCLK(512 kHz or Higher) 50 --- --- ns TMCKL Minimum Pulse Width LOW for MCLK (512 kHz or Higher) 50 --- --- ns TFTRHM MCLK falling Edge to FST Rising Edge Hold Time 50 --- --- ns TFTRSM FST Rising Edge to MCLK Falling edge Setup Time 50 --- --- ns TRISE Rise Time for All Digital Signals --- --- 50 ns TFALL Fall Time for --- --- 50 ns All Digital Signals 55% Table 8.5 General PCM Timing Parameters - 19 - Publication Release Date: April, 2007 Revision C14 W681512 9. ABSOLUTE MAXIMUM RATINGS 9.1. ABSOLUTE MAXIMUM RATINGS Condition Value Junction temperature 1500C Storage temperature range -650C to +1500C Voltage Applied to any pin (VSS - 0.3V) to (VDD + 0.3V) Voltage applied to any pin (Input current limited to +/-20 mA) (VSS – 1.0V) to (VDD + 1.0V) VDD - VSS -0.5V to +6V 1. Stresses above those listed may cause permanent damage to the device. Exposure to the absolute maximum ratings may affect device reliability. Functional operation is not implied at these conditions. 9.2. OPERATING CONDITIONS Condition Value 0 0 Industrial operating temperature -40 C to +85 C Supply voltage (VDD) +4.5V to +5.5V Ground voltage (VSS) 0V Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. - 20 - W681512 10. ELECTRICAL CHARACTERISTICS 10.1. GENERAL PARAMETERS Conditions Min (2) Typ (1) Max (2) Units 0.6 V Symbol Parameters VIL Input LOW Voltage VIH Input HIGH Voltage VOL PCMT Output LOW Voltage IOL = 3 mA VOH PCMT Output HIGH Voltage IOL = -3 mA IDD VDD Current (Operating) - ADC + DAC No Load 6 8 mA ISB VDD Current (Standby) FST & FSR =Vss ; PUI=VDD 10 100 μA Ipd VDD Current (Power Down) PUI= Vss 0.1 10 μA IIL Input Leakage Current VSS<VIN<VDD +/-10 μA IOL PCMT Output Leakage Current VSS<PCMT<VDD +/-10 μA 10 pF 15 pF 2.4 V 0.4 VDD – 0.4 V V High Z State CIN Digital Input Capacitance COUT PCMT Output Capacitance PCMT High Z 1. Typical values: TA = 25°C , VDD = 5.0 V 2. All min/max limits are guaranteed by Winbond via electrical testing or characterization. Not all specifications are 100 percent tested. - 21 - Publication Release Date: April, 2007 Revision C14 W681512 10.2. ANALOG SIGNAL LEVEL AND GAIN PARAMETERS VDD=5V ±10%; VSS=0V; TA=-40°C to +85°C; all analog signals referred to VAG; MCLK=BCLK= 2.048MHz; FST=FSR=8kHz synchronous operation PARAMETER SYM. Absolute Level LABS Max. Transmit Level TXMAX Absolute Gain (0 dBm0 @ 1020 Hz; TA=+25°C) CONDITION TYP. 0 dBm0 = 0dBm @ 600Ω 1.096 TRANSMIT (A/D) RECEIVE (D/A) MIN. MAX. MIN. MAX. --- --- --- --- 0.775 UNIT VPK VRMS 3.17 dBm0 for μ-Law 1.579 --- --- --- --- VPK 3.14 dBm0 for A-Law 1.573 --- --- --- --- VPK GABS 0 dBm0 @ 1020 Hz; TA=+25°C 0 -0.25 +0.25 -0.25 +0.25 dB Absolute Gain variation with Temperature GABST TA=0°C to TA=+70°C 0 -0.03 +0.03 -0.03 +0.03 dB -0.05 +0.05 -0.05 +0.05 Frequency Response, GRTV TA=-40°C to TA=+85°C Relative to 0dBm0 @ 1020 Hz Gain Variation vs. Level Tone (1020 Hz relative to –10 dBm0) GLT 15 Hz --- --- -40 -0.5 0 50 Hz --- --- -30 -0.5 0 60 Hz --- --- -26 -0.5 0 200 Hz --- -1.0 -0.4 -0.5 0 300 to 3000 Hz --- -0.20 +0.15 -0.20 +0.15 3300 Hz --- -0.35 +0.15 -0.35 +0.15 3400 Hz --- -0.8 0 -0.8 0 3600 Hz --- --- 0 --- 0 4000 Hz --- --- -14 --- -14 4600 Hz to 100 kHz --- --- -32 --- -30 +3 to –40 dBm0 --- -0.3 +0.3 -0.2 +0.2 -40 to –50 dBm0 --- -0.6 +0.6 -0.4 +0.4 -50 to –55 dBm0 --- -1.6 +1.6 -1.6 +1.6 - 22 - dB dB W681512 10.3. ANALOG DISTORTION AND NOISE PARAMETERS VDD=5V ±10%; VSS=0V; TA=-40°C to +85°C; all analog signals referred to VAG; MCLK=BCLK= 2.048MHz; FST=FSR=8kHz synchronous operation PARAMETER Total Distortion vs. Level Tone (1020 Hz, μ-Law, C-Message Weighted) Total Distortion vs. Level Tone (1020 Hz, A-Law, Psophometric Weighted) Spurious Out-Of-Band at RO+ (300 Hz to 3400 Hz @ 0dBm0) SYM. DLTμ CONDITION TRANSMIT (A/D) MIN. TYP. MAX. MIN. TYP. MAX. 36 --- --- 34 --- --- 36 --- --- 36 --- --- -40 dBm0 29 --- --- 30 --- --- -45 dBm0 25 --- --- 25 --- --- +3 dBm0 36 --- --- 34 --- --- 36 --- --- 36 --- --- -40 dBm0 29 --- --- 30 --- --- -45 dBm0 25 --- --- 25 --- --- 4600 Hz to 7600 Hz --- --- --- --- --- -30 7600 Hz to 8400 Hz --- --- --- --- --- -40 8400 Hz to 100000 Hz --- --- --- --- --- -30 +3 dBm0 0 dBm0 to -30 dBm0 DLTA 0 dBm0 to -30 dBm0 DSPO RECEIVE (D/A) UNIT dBC dBp dB Spurious In-Band (700 Hz to 1100 Hz @ 0dBm0) DSPI 300 to 3000 Hz --- --- -47 --- --- -47 dB Intermodulation Distortion (300 Hz to 3400 Hz –4 to –21 dBm0 DIM Two tones --- --- -41 --- --- -41 dB Crosstalk (1020 Hz @ 0dBm0) DXT --- --- -75 --- --- -75 dBm0 Absolute Group Delay τABS 1200Hz --- --- 360 --- --- 240 μsec Group Delay Distortion (relative to group delay @ 1200 Hz) τD 500 Hz --- --- 750 --- --- 750 μsec 600 Hz --- --- 380 --- --- 370 1000 Hz --- --- 130 --- --- 120 2600 Hz --- --- 130 --- --- 120 2800 Hz --- --- 750 --- --- 750 μ-Law; C-message --- --- 18 --- --- 13 dBrnc0 A-Law; Psophometric --- --- -68 --- --- -78 dBm0p Idle Channel Noise NIDL - 23 - Publication Release Date: April, 2007 Revision C14 W681512 10.4. ANALOG INPUT AND OUTPUT AMPLIFIER PARAMETERS VDD=5V ±10%; VSS=0V; TA=-40°C to +85°C; all analog signals referred to VAG; PARAMETER SYM. CONDITION MIN. TYP. MAX. UNIT. AI Input Offset Voltage VOFF,AI AI+, AI- --- --- ±25 mV AI Input Current IIN,AI AI+, AI- --- ±0.1 ±1.0 μA AI Input Resistance RIN,AI AI+, AI- to VAG 10 --- --- MΩ AI Input Capacitance CIN,AI AI+, AI- --- --- 10 pF AI Common Mode Input Voltage Range VCM,AI AI+, AI- 1.2 --- VDD-1.2 V AI Common Mode Rejection Ratio CMRRTI AI+, AI- --- 60 --- dB AI Amp Gain Bandwidth Product GBWTI AO, RLD≥10kΩ --- 2150 --- kHz AI Amp DC Open Loop Gain GTI AO, RLD≥10kΩ --- 95 --- dB AI Amp Equivalent Input Noise NTI C-Message Weighted --- -24 --- dBrnC AO Output Voltage Range VTG RLD=10kΩ to VAG 0.5 --- VDD-0.5 V RLD=2kΩ to VAG 1.0 --- VDD-1.0 Load Resistance RLDTGRO AO, RO to VAG 2 --- --- kΩ Load Capacitance CLDTGAO AO --- --- 100 pF Load Capacitance CLDTGRO RO --- --- 500 pF AO & RO Output Current IOUT1 0.5 ≤AO,RO+, RO-≤ VDD0.5 ±1.0 --- --- mA RO+, RO- Output Resistance RRO+, RO- RO+, RO-, 0 to 3400 Hz --- 1 --- Ω RO+, RO- Output Offset Voltage VOFF,RO+,RO- RO+ to VAG --- --- ±25 mV Analog Ground Voltage VAG Relative to VSS 2.2 2.4 2.6 V VAG Output Resistance RVAG Within ±25mV change --- 2.5 12.5 Ω Power Supply Rejection Ratio (0 to 100 kHz to VDD, C-message) PSRR Transmit 30 80 --- dBC Receive 30 75 --- PAI Input Offset Voltage VOFF,PAI PAI --- --- ±25 mV PAI Input Current IIN,PAI PAI --- ±0.05 ±1.0 μA PAI Input Resistance RIN,PAI PAI to VAG 10 --- --- MΩ PAI Amp Gain Bandwidth Product GBWPI PAO- no load --- 1000 --- kHz Output Offset Voltage VOFF,PO PAO+ to PAO- --- --- ±50 mV Load Resistance RLDPO PAO+, PAO- differentially 300 --- --- Ω Load Capacitance CLDPO PAO+, PAO- differentially --- --- 1000 pF PO Output Current IOUTPO VSS + 0.7 ≤PAO- or PAO+≤ VDD-0.7 ±10.0 --- --- mA PO Output Resistance RPO PAO+ to PAO- --- 1 --- Ω - 24 - W681512 PARAMETER SYM. CONDITION MIN. TYP. MAX. UNIT. -0.2 0 +0.2 dB dBC PO Differential Gain GPO RLD=300Ω, +3dBm0, 1 kHz, PAO+ to PAO- PO Differential Signal to Distortion C-Message weighted DPO ZLD=300Ω 45 60 --- ZLD=100nF + 100Ω --- 40 --- ZLD=100nF + 20Ω --- 40 --- 0 to 4 kHz 40 55 --- 4 to 25 kHz --- 40 --- PO Power Supply Rejection Ratio (0 to 25 kHz to VDD, Differential out) PSRRPO - 25 - Publication Release Date: April, 2007 Revision C14 dB W681512 10.5. DIGITAL I/O 10.5.1. μ-Law Encode Decode Characteristics Normalized Encode Decision Levels 8159 Normalized Digital Code D7 D6 D5 D4 D3 D2 D1 D0 Sign Chord Chord Chord Step Step Step Step 1 0 0 0 0 0 0 0 7903 1 0 0 0 1 1 1 1 4063 1 0 0 1 1 1 1 1 2015 1 0 1 0 1 1 1 1 991 1 0 1 1 1 1 1 1 479 1 1 0 0 1 1 1 1 223 1 1 0 1 1 1 1 1 95 99 : : 35 231 : : 103 495 : : 239 1023 : : 511 2079 : : 1055 4191 : : 2143 8031 : : 4319 Decode Levels 1 1 1 0 1 1 1 1 31 33 : : 3 1 1 1 1 1 1 1 1 0 2 1 1 1 1 1 1 1 1 0 0 Notes: Sign bit = 0 for negative values, sign bit = 1 for positive values - 26 - W681512 10.5.2. A-Law Encode Decode Characteristics Normalized Encode Decision Levels 4096 Digital Code Normalized D7 D6 D5 D4 D3 D2 D1 D0 Sign Chord Chord Chord Step Step Step Step 1 0 1 0 1 0 1 0 3968 1 0 1 0 0 1 0 1 2048 1 0 1 1 0 1 0 1 1024 1 0 0 0 0 1 0 1 512 1 0 0 1 0 1 0 1 256 1 1 1 0 0 1 0 1 128 1 1 1 0 0 1 0 1 64 66 : : 2 132 : : 68 264 : : 136 528 : : 272 1056 : : 544 2112 : : 1088 4032 : : 2048 Decode Levels 1 1 0 1 0 1 0 1 1 0 Notes: 1. Sign bit = 0 for negative values, sign bit = 1 for positive values 2. Digital code includes inversion of all even number bits - 27 - Publication Release Date: April, 2007 Revision C14 W681512 10.5.3. PCM Codes for Zero and Full Scale μ-Law Level A-Law Sign bit Chord bits Step bits Sign bit Chord bits Step bits (D7) (D6,D5,D4) (D3,D2,D1,D0) (D7) (D6,D5,D4) (D3,D2,D1,D0) + Full Scale 1 000 0000 1 010 1010 + Zero 1 111 1111 1 101 0101 - Zero 0 111 1111 0 101 0101 - Full Scale 0 000 0000 0 010 1010 10.5.4. PCM Codes for 0dBm0 Output μ-Law Sample A-Law Sign bit Chord bits Step bits Sign bit Chord bits Step bits (D7) (D6,D5,D4) (D3,D2,D1,D0) (D7) (D6,D5,D4) (D3,D2,D1,D0) 1 0 001 1110 0 011 0100 2 0 000 1011 0 010 0001 3 0 000 1011 0 010 0001 4 0 001 1110 0 011 0100 5 1 001 1110 1 011 0100 6 1 000 1011 1 010 0001 7 1 000 1011 1 010 0001 8 1 001 1110 1 011 0100 - 28 - W681512 11. TYPICAL APPLICATION CIRCUIT VDD 17 AO 27K 18 19 AI+ 27K 27K MCLK 20 2 VAG RO- 1 PCMR BCLKR FSR RO+ 0.01 uF 3 14 12 13 8 KHz Frame Sy nc 2.048 MHz Bit Clock 11 PCM OUT 8 9 7 PCM IN PAI VDD 4 PAO- 5 PAO+ DIFFERENTIAL AUDIO OUT RL > 2K ohms + W681512 VSS 1.0 uF FST BCLKT PCMT AI- u/A PUI 16 10 MODE SELECT POWER CONTROL 15 1.0 uF DIFFERENTIAL AUDIO IN + VDD U2 27K 6 0.1 uF Figure 11.1 Typical circuit for Differential Analog I/O’s VDD 27K 18 AUDIO IN 19 27K 1.0 uF 27K 20 2 1 0.01 uF AUDIO OUT RL > 2K ohms 27K 3 27K 4 5 AUDIO OUT RL > 150 ohms 100 uF AO FST BCLKT PCMT AIAI+ MCLK VAG RO- PCMR BCLKR FSR RO+ 14 12 13 8 KHz Frame Sy nc 2.048 MHz Bit Clock 11 PCM OUT 8 9 7 PCM IN PAI PAOPAO+ W681512 VSS 1.0 uF u/A PUI 16 10 MODE SELECT POWER CONTROL 15 17 VDD U3 27K 6 0.1 uF Figure 11.2 Typical circuit for Single Ended Analog I/O’s - 29 - Publication Release Date: April, 2007 Revision C14 W681512 VDD 1K 0.1 uF 6 22 uF U4 + 1.0 uF 3.9K 100pF 18 1.0 uF 3.9K 19 100pF ELECTRET MICROPHONE 20 2 62K 0.01 uF 1 27K 27K 3 1.5K 27K 4 5 AO FST BCLKT PCMT AIAI+ MCLK VAG RO- PCMR BCLKR FSR RO+ 14 12 13 8 KHz Frame Sy nc 2.048 MHz Bit Clock 11 PCM OUT 8 9 7 PCM IN PAI PAOPAO+ W681512 u/A PUI VSS 17 VDD 62K 16 10 MODE SELECT POWER CONTROL 15 1.5K SPEAKER Figure 11.3 Handset Interface VDD 1.0 uF 19 20 2 600 27K 1 0.01 uF TRANSFORMER 600 OHM 1:1 3 27K 4 5 AO FST BCLKT PCMT AIAI+ MCLK VAG RO- PCMR BCLKR FSR RO+ PAO+ 8 KHz Frame Sy nc 2.048 MHz Bit Clock 11 PCM OUT 8 9 7 PCM IN B1/B2 SELECT PAO- W681512 u/A PUI Figure 11.4 Transformer Interface Circuit in GCI mode - 30 - 14 12 13 PAI VSS 18 15 17 27K VDD U5 27K 6 0.1 uF 16 10 MODE SELECT POWER CONTROL W681512 12. PACKAGE SPECIFICATION 12.1. 20L SOG (SOP)-300MIL SMALL OUTLINE PACKAGE (SAME AS SOG & SOIC) DIMENSIONS 11 20 c E H E L 10 1 O D 0.25 A Y SEATING PLANE e GAUGE PLANE A1 b - 31 - Publication Release Date: September, 2005 Revision C13 W681512 DIMENSION (MM) DIMENSION (INCH) SYMBOL MIN. MAX. MIN. MAX. A 2.35 2.65 0.093 0.104 A1 0.10 0.30 0.004 0.012 b 0.33 0.51 0.013 0.020 c 0.23 0.32 0.009 0.013 E 7.40 7.60 0.291 0.299 D 12.60 13.00 0.496 0.512 e 1.27 BSC 0.050 BSC HE 10.00 10.65 0.394 0.419 Y - 0.10 - 0.004 L 0.40 1.27 0.016 0.050 0 0º 8º 0º 8º - 32 - W681512 12.2. 20L SSOP-209 MIL SHRINK SMALL OUTLINE PACKAGE DIMENSIONS D 11 20 DTEAIL A H E E 1 10 A2 b A SEATING PLANE SEATING PLANE θ L Y L1 e b A1 DETAIL A - 33 - Publication Release Date: September, 2005 Revision C13 W681512 DIMENSION (MM) DIMENSION (INCH) SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. A - - 2.00 - - 0.079 A1 0.05 - - 0.002 - - A2 1.65 1.75 1.85 0.065 0.069 - b 0.22 - 0.38 0.009 - 0.015 c 0.09 - 0.25 0.004 - 0.010 D 6.90 7.20 7.50 0.272 0.283 0.295 E 5.00 5.30 5.60 0.197 0.209 0.220 HE 7.40 7.80 8.20 0.291 0.307 0.323 e - 0.65 - - 0.0256 - L 0.55 0.75 0.95 0.021 0.030 0.037 L1 - 1.25 - - 0.050 - Y - - 0.10 - - 0.004 0 0º - 8º 0 - 8º - 34 - W681512 12.3. 20L TSSOP - 4.4X6.5MM PLASTIC THIN SHRINK SMALL OUTLINE PACKAGE (TSSOP) DIMENSIONS SYMBOL A MIN. - DIMENSION (MM) NOM. MAX. 1.20 MIN. - DIMENSION (INCH) NOM. MAX. 0.047 A1 0.05 - 0.15 0.002 - 0.006 A2 0.80 0.90 1.05 0.031 0.035 0.041 E 4.30 4.40 4.50 0.169 0.173 0.177 6.50 6.60 0.252 0.60 0.75 0.020 HE 6.40 BSC D 6.40 L 0.50 L1 b 1.00 REF 0.19 e c 0 Y .252 BSC - 0º 0.260 0.024 0.030 0.039 REF 0.30 0.007 0.65 BSC 0.09 0.256 - 0.012 0.026 BSC - 0.20 0.004 - 8º 0º 0.10 BASIC - 0.008 - 8º 0.004 BASIC - 35 - Publication Release Date: September, 2005 Revision C13 W681512 13. ORDERING INFORMATION Winbond Part Number Description W681512_ _ Product Family W681512 Product Package Material: Blank = Standard Package G = Pb-free Package Package Type: S = 20-Lead Plastic Small Outline Package (SOG/SOP) R = 20-Lead Plastic Shrink Small Outline Package (SSOP) WG = 20-Lead Free Plastic Thin Shrink Small Outline Package (TSSOP) When ordering W681512 series devices, please refer to the following part numbers. Part Number W681512S* W681512R* W681512SG W681512RG W681512WG *All Pb packages will be available for a limited time. Thus, Pb-free packages are strongly recommended. - 36 - W681512 14. VERSION HISTORY VERSION DATE PAGE DESCRIPTION A10 March 25, 2003 A11 April 2, 2003 7 VAG: fixed the voltage value from 2.5V to 2.4V B11 July, 2004 2 6 Added reference to SSOP package. Revised Applications section. 32 Added reference to SSOP package. 33 Added description of SSOP package. First revision Added R package ordering code. C11 November, 2004 2 Added reference to TSSOP package and Pb-free packaging. 6 Added reference to TSSOP package. 32 Added description of TSSOP package. 33 Added W and G package ordering code. 22 Extended conditions on Table 10.2. 23 Extended conditions on Table 10.3. Corrected Idle Channel Noise min/max and units. 29 Improved Application Diagram. 30 Improved Application Diagram. Add Important Notice C12 April 2005 37 C13 September , 2005 29, 30 Various 2, 22 C14 April, 2007 Improved Applications Diagram Capilatized Logic HIGH/LOW Added reference to VRMS 31 SOP Package diagram legible 33 SSOP Package diagram legible 35 TSSOP Package diagram legible 36 Removed Pb TSSOP Package 36 Footnote on Pb parts limited availability Important Notice Winbond products are not designed, intended, authorized or warranted for use as components in systems or equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal - 37 - Publication Release Date: September, 2005 Revision C13 W681512 instruments, combustion control instruments, or for other applications intended to support or sustain life. Further more, Winbond products are not intended for applications wherein failure of Winbond products could result or lead to a situation wherein personal injury, death or severe property or environmental damage could occur. Winbond customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Winbond for any damages resulting from such improper use or sales. The information contained in this datasheet may be subject to change without notice. It is the responsibility of the customer to check the Winbond USA website (www.winbond-usa.com) periodically for the latest version of this document, and any Errata Sheets that may be generated between datasheet revisions. - 38 -