4-BIT PARALLEL-TO-SERIAL CONVERTER Micrel, Inc. SY100E446 DESCRIPTION FEATURES ■ On-chip clock ÷4 and ÷8 ■ Extended 100E VEE range of –4.2V to –5.5V ■ ■ ■ ■ ■ ■ ■ ■ SY10E446 SY100E446 SY10E446 The SY10/100E446 are integrated 4-bit parallel-toserial data converters. These devices are designed to operate for NRZ data rates of up to a minimum of 1.3Gb/ s. The chips generate a divide-by-4 and a divide-by-8 clock for both 4-bit conversion and a two-chip 8-bit conversion function. The conversion sequence was chosen to convert the parallel data into a serial stream from bit D0 to D3. A serial input is provided to cascade two E446 devices for 8-bit conversion applications. The SYNC input will asynchronously reset the internal clock circuitry. This pin allows the user to reset the internal clock conversion unit and, thus, select the start of the conversion process. The MODE input is used to select the conversion mode of the device. With the MODE input LOW (or open) the device will function as a 4-bit converter. When the mode input is driven HIGH, the internal load clock will change on every eighth clock cycle, thus allowing for an 8-bit conversion scheme using two E446s. When cascaded in an 8-bit conversion scheme, the devices will not operate at the 1.3Gb/s data rate of a single device. Refer to the applications section of this data sheet for more information on cascading the E446. For lower data rate applications, a V BB reference voltage is supplied for single-ended inputs. When operating at clock rates above 500MHz, differential input signals are recommended. For single-ended inputs, the VBB pin is tied to the inverting differential input and bypassed via a 0.01µF capacitor. The VBB provides the switching reference for the input differential amplifier. The VBB can also be used to AC couple an input signal. 1.6Gb/s typical data rate capability Differential clock and serial inputs VBB output for single-ended use Asynchronous data synchronization Mode select to expand to 8 bits Internal 75KΩ input pulldown resistors Fully compatible with Motorola MC10E/100E446 Available in 28-pin PLCC package PIN NAMES Pin Function SIN, SIN Differential Serial Data Input D0 – D3 Parallel Data Input SOUT, SOUT Differential Serial Data Output CLK, CLK Differential Clock Input CL/4, CL/4 Differential 4 Clock Output CL/8, CL/8 Differential 8 Clock Output MODE Conversion Mode, 4-bit/8-bit SYNC Conversion Synchronizing Input VCCO VCC to Output M9999-032206 [email protected] or (408) 955-1690 1 Rev.: F Amendment: /0 Issue Date: March 2006 SY10E446 SY100E446 Micrel, Inc. Ordering Information(1) NC MODE NC D2 D3 D0 D1 PACKAGE/ORDERING INFORMATION 25 24 23 22 21 20 19 CLK CLK 26 18 NC 27 17 VBB VEE SIN 28 16 NC VCC 15 SOUT 14 13 4 12 NC 7 8 9 10 11 VCCO 6 VCCO CL/8 5 CL/8 3 SOUT VCCO 2 VCCO CL/4 CL/4 SIN SYNC TOP VIEW PLCC J28-1 1 28-Pin PLCC (J28-1) Part Number Package Type Operating Range Package Marking Lead Finish SY10E446JC J28-1 Commercial SY10E446JC Sn-Pb SY10E446JCTR(2) J28-1 Commercial SY10E446JC Sn-Pb SY100E446JC J28-1 Commercial SY100E446JC Sn-Pb SY100E446JCTR(2) J28-1 Commercial SY100E446JC Sn-Pb SY10E446JZ(3) J28-1 Commercial SY10E446JZ with Pb-Free bar-line indicator Matte-Sn Pb-Free SY10E446JZTR(2, 3) J28-1 Commercial SY10E446JZ with Pb-Free bar-line indicator Matte-Sn Pb-Free SY100E446JZ(3) J28-1 Commercial SY100E446JZ with Pb-Free bar-line indicator Matte-Sn Pb-Free SY100E446JZTR(2, 3) J28-1 Commercial SY100E446JZ with Pb-Free bar-line indicator Matte-Sn Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only. 2. Tape and Reel. M9999-032206 [email protected] or (408) 955-1690 2 SY10E446 SY100E446 Micrel, Inc. BLOCK DIAGRAM SIN SIN D3 0 D Q 1 CLK 0 D D2 Q 1 CLK 0 D D1 Q 1 CLK 0 SOUT D D0 Q SOUT 1 CLK CL/8 MODE 0 1 CL/8 CLK CLK DELAY ÷4 ÷8 R R CL/4 CL/4 SYNC VBB M9999-032206 [email protected] or (408) 955-1690 3 SY10E446 SY100E446 Micrel, Inc. TRUTH TABLE Mode Conversion L 4-Bit H 8-Bit DC ELECTRICAL CHARACTERISTICS VEE = VEE (Min.) to VEE (Max.); VCC = VCCO = GND TA = 0°C Symbol Parameter Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition — — 150 — — 150 — — 150 µA — Output HIGH Voltage (SOUT Only) 10E –1020 (SOUT Only) 100E –1025 V 1 — — –790 –980 –830 –1025 — — –760 –910 –830 –1025 — — –670 –830 Output Reference Voltage 10E 100E V — –1.38 –1.38 — — –1.27 –1.35 –1.26 –1.38 — — –1.25 –1.31 –1.26 –1.38 — — –1.19 –1.26 mA — — — 110 110 110 127 132 152 Input HIGH Current VOH IEE TA = +85°C Min. IIH VBB TA = +25°C Power Supply Current 10E 100E 132 132 — — 110 110 132 132 — — Note: 1. The maximum VOH limit was relaxed from standard ECL due to the high frequency output design. All other outputs are specified with the standard 10E and 100E VOH levels. AC ELECTRICAL CHARACTERISTICS VEE = VEE (Min.) to VEE (Max.); VCC = VCCO = GND TA = 0°C Symbol TA = +25°C Parameter Min. Typ. fMAX Max. Conversion Frequency 1.3 1.6 tPD Propagation Delay to Output CLK to SOUT 1000 CLK to CL/4 500 CLK to CL/8 800 SYNC to CL/4, CL/8 500 1400 800 1100 800 Set-up Time SIN Dn Mode –200 –200 0 –400 –400 –250 — — — Hold Time SIN Dn Mode 750 800 500 550 600 300 tRR Reset Recovery Time 500 tPW Minimum Pulse Width CLK, MR tr tf Rise/Fall Time SOUT Other tS tH M9999-032206 [email protected] or (408) 955-1690 Max. Min. TA = +85°C Typ. Max. Min. Typ. Max. Unit Condition 1.6 — 1.3 1.6 — Gb/s NRZ — ps — 1400 800 1100 800 1700 1100 1400 1100 1000 500 800 500 1400 800 1100 800 1700 1100 1400 1100 ps — –200 –200 0 –400 –400 –250 — — — –200 –200 0 –400 –400 –250 — — — ps — — — — 750 800 500 550 600 300 — — — 750 800 500 550 600 300 — — — 200 — 500 200 — 500 200 — ps — 400 — — 400 — — 400 — — ps — ps 20–80% 100 200 225 425 350 650 100 200 225 425 350 650 100 200 225 425 350 650 — 1.3 1700 1000 1100 500 1400 800 1100 500 4 SY10E446 SY100E446 Micrel, Inc. TIMING DIAGRAMS CLK RESET D0 D0–1 D1 D1–1 D2 D2–1 D3 D3–1 SOUT CL/4 CL/8 Timing Diagram A. 4:1 Parallel-to-Serial Conversion M9999-032206 [email protected] or (408) 955-1690 5 SY10E446 SY100E446 Micrel, Inc. TIMING DIAGRAMS (CONTINUED) CLK RESET D0 D0–1 D1 D1–1 D2 D2–1 D3 D3–1 D4(D0B) D4–1 D5(D1B) D5–1 D6(D2B) D6–1 D7(D3B) D7–1 SOUT Timing Diagram B. 8:1 Parallel-to-Serial Conversion M9999-032206 [email protected] or (408) 955-1690 6 SY10E446 SY100E446 Micrel, Inc. APPLICATIONS INFORMATION The SY10E/100E446 are integrated 4:1 parallel-to-serial converters. The chips are designed to work with the E445 device to provide both transmission and receiving of a highspeed serial data path. The E446 can convert 4 bits of data into a 1.3Gb/s NRZ data stream. The device features a SYNC input which allows the user to reset the internal clock circuitry and restart the conversion sequence (see Timing Diagram A). Note that SOUT is triggered by negative clock edges. The E446 features a differential serial input and internal divide-by-eight circuitry to facilitate the cascading of two devices to build an 8:1 multiplexer. Figure 1 illustrates the architecture for an 8:1 multiplexer using two E446s (see Timing Diagram B). Notice the serial outputs (SOUT) of the lower order converter feed the serial inputs of the higher order device. This feed through of the serial inputs bounds the upper end of the frequency of operation. The clock-toserial output propagation delay, plus the set-up time of the serial input pins, must fit into a single clock period for the cascade architecture to function properly. Using the worst case values for these two parameters from the data sheet, tPD CLK to SOUT = 1600ps and ts for SIN = –200ps, yields a minimum period of 1400ps or a clock frequency of 700MHz. The clock frequency is somewhat lower than that of a single converter. In order to increase this frequency, it is recommended that the clock edge feeding the E446A be delayed with respect to the E446B, as shown in Figure 2. Perhaps the easiest way to delay the second clock relative to the first is to take advantage of the differential clock inputs of the E446. By connecting the clock for E446A to the complimentary clock input pin, the device will clock a half a clock period after E446B (Figure 2). Utilizing this simple technique will raise the potential conversion frequency up to the maximum 1.3GHz of a stand-alone E446. CLK CLK E446B E446A SOUT SIN SOUT SOUT SIN SOUT D3 D2 D1 D0 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 PARALLEL DATA 1400ps CLK tPD CLK to SOUT 1600ps Figure 1. Cascaded 8:1 Converter Architecture M9999-032206 [email protected] or (408) 955-1690 7 200ps SERIAL DATA SY10E446 SY100E446 Micrel, Inc. APPLICATIONS INFORMATION CLK CLK E446B E446A SOUT SIN SOUT SOUT SIN SOUT D3 D2 D1 D0 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 PARALLEL DATA 1.3GHz 770ps CLKB CLKA tPD CLK to SOUT Figure 2. Extended Frequency 8:1 Converter Architecture M9999-032206 [email protected] or (408) 955-1690 8 SERIAL DATA SY10E446 SY100E446 Micrel, Inc. 28-PIN PLCC (J28-1) Rev. 03 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. M9999-032206 [email protected] or (408) 955-1690 9