M27W512 512 Kbit (64 Kbit x8) low-voltage OTP EPROM Features ■ 2.7 to 3.6 V supply voltage in read operation ■ Access time: 100 ns ■ Pin compatibility with M27C512 ■ Low power consumption – 15 µA max Standby current – 15 mA max Active current at 5 MHz ■ Programming time 100 µs/byte ■ High reliability CMOS technology – 2000 V ESD protection – 200 mA latch-up protection immunity ■ Electronic signature – Manufacturer code: 20h – Device code: 3Dh ■ ECOPACK® packages June 2008 PLCC32 (K) Rev 4 1/22 www.st.com 1 Contents M27W512 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Two line output control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 System considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.5 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 PRESTO IIB programming algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.7 Program inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.8 Program verify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.9 Electronic signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 M27W512 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electronic signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Read mode DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Read mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Programming mode DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Margin mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Programming mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 PLCC32 - 32 lead plastic leaded chip carrier, package mechanical data. . . . . . . . . . . . . . 19 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3/22 List of figures M27W512 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. 4/22 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 LCC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Programming flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 AC testing input output waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Read mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Margin mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Programming and verify mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 PLCC32 - 32 lead plastic leaded chip carrier, package outline . . . . . . . . . . . . . . . . . . . . . 19 M27W512 1 Description Description The M27W512 is a low-voltage, 512 Kbit OTP (one-time programmable) EPROM. It is ideally suited to microprocessor systems and are organized as 65536 by 8 bits. The M27W512 operates in the read mode with a supply voltage as low as 2.7 V at –40 to 85 °C temperature range. The decrease in operating power allows either a reduction of the size of the battery or an increase in the time between battery recharges. For applications where the content is programmed only one time and erasure is not required, the M27W512 is offered in PLCC32 packages. Figure 1. Logic diagram VCC 16 8 A0-A15 E Q0-Q7 M27W512 GVPP VSS AI01584 5/22 Description M27W512 Table 1. Signal names Signal names Function A0-A15 Address inputs Q0-Q7 Data outputs E Chip Enable GVPP Output Enable / Program supply VCC Supply voltage VSS Ground NC Not connected internally DU Don’t use LCC connections A7 A12 A15 DU VCC A14 A13 Figure 2. 1 32 A6 A5 A4 A3 A2 A1 A0 NC Q0 9 M27W512 25 A8 A9 A11 NC GVPP A10 E Q7 Q6 VSS DU Q3 Q4 Q5 Q1 Q2 17 AI01585 6/22 M27W512 2 Device operation Device operation The modes of operations of the M27W512 are listed in Table 2: Operating modes. A single power supply is required in the read mode. All inputs are TTL levels except for GVPP and 12V on A9 for Electronic Signature. 2.1 Read mode The M27W512 has two control functions, both of which must be logically active in order to obtain data at the outputs. Chip Enable (E) is the power control and should be used for device selection. Output Enable (G) is the output control and should be used to gate data to the output pins, independent of device selection. Assuming that the addresses are stable, the address access time (tAVQV) is equal to the delay from E to output (tELQV). Data is available at the output after a delay of tGLQV from the falling edge of G, assuming that E has been low and the addresses have been stable for at least tAVQV-tGLQV. 2.2 Standby mode The M27W512 has a standby mode which reduces the supply current from 15mA to 15µA with low voltage operation VCC ≤ 3.6V, see Table 7: Read mode DC characteristics. Characteristics table for details. The M27W512 is placed in the standby mode by applying a CMOS high signal to the E input. When in the standby mode, the outputs are in a high impedance state, independent of the GVPP input. Table 2. Operating modes(1) Mode E GVPP A9 Q7-Q0 Read VIL VIL X Data Out Output Disable VIL VIH X Hi-Z VIL Pulse VPP X Data In Program Inhibit VIH VPP X Hi-Z Standby VIH X X Hi-Z Electronic Signature VIL VIL VID Codes Program 1. X = VIH or VIL, VID = 12V ± 0.5V. Table 3. Electronic signature Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex data Manufacturer code VIL 0 0 1 0 0 0 0 0 20h Device code VIH 0 0 1 1 1 1 0 1 3Dh 7/22 Device operation 2.3 M27W512 Two line output control Because EPROMs are usually used in larger memory arrays, the product features a 2 line control function which accommodates the use of multiple memory connection. The two line control function allows: ● The lowest possible memory power dissipation ● Complete assurance that output bus contention will not occur. For the most efficient use of these two control lines, E should be decoded and used as the primary device selecting function, while G should be made a common connection to all devices in the array and connected to the READ line from the system control bus. This ensures that all deselected memory devices are in their low power standby mode and that the output pins are only active when data is required from a particular memory device. 2.4 System considerations The power switching characteristics of Advanced CMOS EPROMs require careful decoupling of the devices. The supply current, ICC, has three segments that are of interest to the system designer: the standby current level, the active current level, and transient current peaks that are produced by the falling and rising edges of E. The magnitude of the transient current peaks is dependent on the capacitive and inductive loading of the device at the output. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors. It is recommended that a 0.1µF ceramic capacitor be used on every device between VCC and VSS. This should be a high frequency capacitor of low inherent inductance and should be placed as close to the device as possible. In addition, a 4.7µF bulk electrolytic capacitor should be used between VCC and VSS for every eight devices. The bulk capacitor should be located near the power supply connection point.The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces. 8/22 M27W512 Device operation Figure 3. Programming flowchart VCC = 6.25V, VPP = 12.75V SET MARGIN MODE n=0 E = 100μs Pulse NO ++n = 25 YES FAIL NO ++ Addr VERIFY YES Last Addr NO YES RESET MARGIN MODE CHECK ALL BYTES 1st: VCC = 5V 2nd: VCC = 2.7V AI00738C 2.5 Programming The M27W512 has been designed to be fully compatible with the M27C512 and has the same electronic signature. As a result, the M27W512 can be programmed as the M27C512 on the same programming equipment applying 12.75V on VPP and 6.25V on VCC. The M27W512 can use PRESTO IIB Programming Algorithm that drastically reduces the programming time. Nevertheless to achieve compatibility with all programming equipment, PRESTO II Programming Algorithm can be used as well. When delivered, all bits of the M27W512 are in the '1' state. Data is introduced by selectively programming '0's into the desired bit locations. Although only '0's will be programmed, both '1's and '0's can be present in the data word. The M27W512 is in the programming mode when VPP input is at 12.75V and E is pulsed to VIL. The data to be programmed is applied to 8 bits in parallel to the data output pins. The levels required for the address and data inputs are TTL. VCC is specified to be 6.25V ± 0.25V. 9/22 Device operation 2.6 M27W512 PRESTO IIB programming algorithm PRESTO IIB programming algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 6.5 seconds. This can be achieved with STMicroelectronics M27W512 due to several design innovations described in the M27W512 datasheet to improve programming efficiency and to provide adequate margin for reliability. Before starting the programming the internal MARGIN MODE circuit must be set in order to guarantee that each cell is programmed with enough margin. Then a sequence of 100µs program pulses is applied to each byte until a correct verify occurs (see Figure 3). No overprogram pulses are applied since the verify in MARGIN MODE at VCC much higher than 3.6V, provides the necessary margin. 2.7 Program inhibit Programming of multiple devices in parallel with different data is also easily accomplished. Except for E, all like inputs including GVPP of the parallel M27W512 may be common. A TTL low level pulse applied to a M27W512 E input, with VPP at 12.75V, will program this device. A high level E input inhibits the other M27W512 from being programmed. 2.8 Program verify A verify (read) should be performed on the programmed bits to determine that they were correctly programmed. The verify is accomplished with G at VIL. Data should be verified with tELQV after the falling edge of E. 2.9 Electronic signature The Electronic Signature (ES) mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and type. This mode is intended for use by programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C ambient temperature range that is required when programming the M27W512. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27W512. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signature mode. Byte 0 (A0 = VIL) represents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27W512, these two identifier bytes are given in Table 3 and can be read-out on outputs Q7 to Q0. Note that the M27W512 and M27C512 have the same identifier byte. 10/22 M27W512 3 Maximum rating Maximum rating Stressing the device outside the ratings listed in Table 4 may cause permanent damage to the device. These are stress ratings only, and operation of the device at these, or any other conditions outside those indicated in the operating sections of this specification, is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 4. Absolute maximum ratings Symbol TA Parameter Ambient operating temperature(1) Value Unit –40 to 125 °C TBIAS Temperature under bias –50 to 125 °C TSTG Storage temperature –65 to 150 °C VIO(2) Input or output voltage (except A9) –2 to 7 V Supply voltage –2 to 7 V –2 to 13.5 V –2 to 14 V VCC VA9(2) VPP A9 voltage Program supply voltage 1. Depends on range. 2. Minimum DC voltage on input or output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns. 11/22 DC and AC parameters 4 M27W512 DC and AC parameters This section summarizes the operating and measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC Characteristic tables that follow are derived from tests performed under the Measurement Conditions summarized in the relevant tables. Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parameters. Table 5. AC measurement conditions High speed Standard Input rise and fall times ≤10ns ≤20ns Input pulse voltages 0 to 3V 0.4V to 2.4V 1.5V 0.8V and 2V Input and output timing ref. voltages Figure 4. AC testing input output waveform High Speed 3V 1.5V 0V Standard 2.4V 2.0V 0.8V 0.4V AI01822 Figure 5. AC testing load circuit 1.3V 1N914 3.3kΩ DEVICE UNDER TEST OUT CL CL = 30pF for High Speed CL = 100pF for Standard CL includes JIG capacitance 12/22 AI01823B M27W512 Table 6. DC and AC parameters Capacitance Symbol CIN COUT Parameter Input capacitance Output capacitance Test condition(1)(2) Min Max Unit VIN = 0V 6 pF VOUT = 0V 12 pF 1. TA = 25°C, f = 1MHz 2. Sampled only, not 100% tested. Table 7. Symbol Read mode DC characteristics Parameter Test condition(1) Min Max Unit 0V ≤VIN ≤VCC ±10 µA 0V ≤VOUT ≤VCC ±10 µA E = VIL, G = VIL, IOUT = 0mA, f = 5MHz VCC ≤3.6V 15 mA E = VIH 1 mA E > VCC – 0.2V, VCC ≤3.6V 15 µA VPP = VCC 10 µA ILI Input leakage current ILO Output leakage current ICC Supply current ICC1 Supply current (Standby) TTL ICC2 Supply current (Standby) CMOS IPP Program current VIL Input low voltage –0.6 0.2 VCC V Input high voltage 0.7 VCC VCC + 0.5 V 0.4 V VIH (2) VOL Output low voltage IOL = 2.1mA VOH Output high voltage TTL IOH = –1mA 2.4 V 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Maximum DC voltage on Output is VCC +0.5V. 13/22 DC and AC parameters Table 8. M27W512 Read mode AC characteristics M27W512 Symbol Alt Test condition Parameter (1) -70(2) -80(2) -100 VCC = 3.0 to 3.6V VCC = 2.7 to 3.6V VCC = 2.7 to 3.6V Min Min Min Max Max Unit Max tAVQV tACC Address valid to output valid E = VIL, G = VIL 70 80 100 ns tELQV tCE Chip Enable low to output valid G = VIL 70 80 100 ns tGLQV tOE Output Enable low to output valid E = VIL 40 50 60 ns tEHQZ(3) tDF Chip Enable high to output Hi-Z G = VIL 0 40 0 50 60 ns tGHQZ(3) tDF Output Enable high to output Hi-Z E = VIL 0 40 0 50 60 ns tAXQX tOH Address transition to output transition E = VIL, G = VIL 0 0 ns 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Speed obtained with High Speed AC measurement conditions. 3. Sampled only, not 100% tested. Figure 6. Read mode AC waveforms A0-A15 VALID tAVQV VALID tAXQX E tGLQV tEHQZ G tELQV Q0-Q7 tGHQZ Hi-Z AI00735B 14/22 M27W512 Table 9. DC and AC parameters Programming mode DC characteristics Symbol Test condition(1)(2) Parameter Min VIL ≤VIN ≤VIH Max Unit ±10 µA 50 mA 50 mA ILI Input leakage current ICC Supply current IPP Program current VIL Input low voltage –0.3 0.8 V VIH Input high voltage 2 VCC + 0.5 V VOL Output low voltage IOL = 2.1mA 0.4 V VOH Output high voltage TTL IOH = –1mA VID A9 voltage E = VIL 3.6 V 11.5 12.5 V 1. TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V 2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. Table 10. Margin mode AC characteristics Parameter Test condition(1)(2) Symbol Alt Min Max Unit tA9HVPH tAS9 VA9 high to VPP high 2 µs tVPHEL tVPS VPP high to Chip Enable low 2 µs tA10HEH tAS10 VA10 high to Chip Enable high (set) 1 µs tA10LEH tAS10 VA10 low to Chip Enable high (reset) 1 µs tEXA10X tAH10 Chip Enable transition to VA10 transition 1 µs tEXVPX tVPH Chip Enable transition to VPP transition 2 µs tVPXA9X tAH9 VPP transition to VA9 transition 2 µs 1. TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V 2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 15/22 DC and AC parameters Figure 7. M27W512 Margin mode AC waveforms VCC A8 A9 tA9HVPH tVPXA9X GVPP tVPHEL tEXVPX E tA10HEH tEXA10X A10 Set A10 Reset tA10LEH AI00736B 1. A8 High level = 5V; A9 High level = 12V. Table 11. Programming mode AC characteristics Parameter Test condition(1)(2) Symbol Alt Min tAVEL tAS Address valid to Chip Enable low 2 µs tQVEL tDS Input Valid to Chip Enable low 2 µs tVCHEL tVCS VCC high to Chip Enable low 2 µs tVPHEL tOES VPP high to Chip Enable low 2 µs tVPLVPH tPRT VPP rise time 50 ns tELEH tPW Chip Enable program pulse width (Initial) 95 tEHQX tDH Chip Enable high to input transition 2 µs tEHVPX tOEH Chip Enable high to VPP transition 2 µs tVPLEL tVR VPP low to Chip Enable low 2 µs tELQV tDV Chip Enable low to output valid tEHQZ(3) tDFP Chip Enable high to output Hi-Z 0 tEHAX tAH Chip Enable high to address transition 0 1. TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V 2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 3. Sampled only, not 100% tested. 16/22 Max 105 Unit µs 1 µs 130 ns ns M27W512 Figure 8. DC and AC parameters Programming and verify mode AC waveforms A0-A15 VALID tAVEL tEHAX DATA IN Q0-Q7 DATA OUT tEHQX tQVEL VCC tEHQZ tELQV tVCHEL tEHVPX GVPP tVPLEL tVPHEL E tELEH PROGRAM VERIFY AI00737 17/22 Package mechanical data 5 M27W512 Package mechanical data In order to meet environmental requirements, ST offers the M27W512 in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at www.st.com. 18/22 M27W512 Package mechanical data Figure 9. PLCC32 - 32 lead plastic leaded chip carrier, package outline D D1 A1 A2 1 N B1 E2 e E1 E E3 F B 0.51 (.020) E2 1.14 (.045) A D3 R D2 CP D2 PLCC-A 1. Drawing is not to scale. Table 12. PLCC32 - 32 lead plastic leaded chip carrier, package mechanical data inches(1) millimeters Symbol Typ Min Max A 3.175 A1 Min Max 3.556 0.1250 0.1400 1.530 2.413 0.0602 0.0950 A2 0.381 - 0.0150 - B 0.330 0.533 0.0130 0.0210 B1 0.660 0.813 0.0260 0.0320 CP Typ 0.100 0.0039 D 12.319 12.573 0.4850 0.4950 D1 11.354 11.506 0.4470 0.4530 D2 4.780 5.660 0.1882 0.2228 - - - - E 14.859 15.113 0.5850 0.5950 E1 13.894 14.046 0.5470 0.5530 E2 6.050 6.930 0.2382 0.2728 D3 7.620 0.3000 E3 10.160 - - 0.4000 - - e 1.270 - - 0.0500 - - 0.000 0.127 0.0000 0.0050 - - - - F R N (number of pins) 0.889 0.0350 32 32 1. Values in inches are converted from mm and rounded to 4 decimal digits. 19/22 Part numbering 6 M27W512 Part numbering Table 13. Ordering information scheme Example: M27W512 -100 K 6 TR Device type M27 Supply voltage W = 2.7 V to 3.6 V Device function 512 = 512 Kbit (64 Kb x 8) Speed -100= 100 ns Package K = PLCC32 Temperature range 6 = –40 to 85 °C Options Blank = Standard packing TR = Tape and reel packing For a list of available options (speed, package, etc.) or for further information on any aspect of this device, please contact your nearest ST sales office. 20/22 M27W512 7 Revision history Revision history Table 14. Document revision history Date Revision Changes 20-Mar-2000 1.1 FDIP28W Package Dimension, L Max added (Table 12) TSOP32 Package Dimension changed (Table 13) 0 to 70°C Temperature Range deleted Speed Classes changed 15-Jun-2001 1.2 Typing error (Table 8) 30-Aug-2002 1.3 Package mechanical data clarified for FDIP28W (Table 12), PDIP28 (Table 13), PLCC32 (Table 12, Figure 9) and TSOP28 (Table 13, Figure 11) 08-Nov-2004 2.0 Details of ECOPACK lead-free package options added 27-Apr-2007 09-Jun-2008 3 Document reformatted. FDIP28W and PDIP28 packages removed. 120, 150 and 200ns access times removed from Table 13: Ordering information scheme. 4 Small text changes. UV range no longer offered (references to UV removed). TSOP28 package removed. Package mechanical data in inches calculated from millimeters and rounded to three decimals (see Table 12: PLCC32 - 32 lead plastic leaded chip carrier, package mechanical data). E and F options and 80 ns speed class removed from Table 13: Ordering information scheme. 21/22 M27W512 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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