3-BIT SCANNABLE REGISTERED BUS TRANSCEIVER FEATURES The SY10/100E337 are 3-bit registered bus transceivers with scan designed for use in new, high- performance ECL systems. The bus outputs (BUS0–BUS2) are designed to drive a 25Ω bus; the receive outputs (Q0–Q2) are designed for 50Ω. The bus outputs feature a normal logic HIGH level (VOH) and a cutoff LOW level of –2.0V and the output emitter-follower is “off”, presenting a high impedance to the bus. The bus outputs also feature edge slow-down capacitors. Both drive and receive sides feature the same logic, including a loopback path to hold data. The LOAD/HOLD function is controlled by Transmit Enable (TEN) and Receive Enable (REN) on the transmit and receive sides, respectively, with a HIGH selecting LOAD. The implementation of the E337 Receive Enable differs from that of the E336. A synchronous bus enable (SBUSEN) is provided for normal, non-scan operation. The asynchronous bus disable (ABUSDIS) disables the bus for scan mode. The SYNCEN input allows either synchronous or asynchronous re-enabling after disabling with ABUSDIS. An alternative use is asynchronous-only operation with ABUSDIS, in which case SYNCEN is tied LOW. SYNCEN is implemented as an overriding SET control to the enable flip-flop. Scan mode is selected by a logic HIGH at the SCAN input. Scan input data is shifted in through S-IN, and output data appears at the Q2 output. All registers are clocked on the rising edge of CLK. Additional lead-frame grounding is provided through the ground pins (GND) which should be connected to 0V. The GND pins are not electrically connected to the chip. Q0 VCCO B0 A0 ABUSDIS PIN CONFIGURATION SBUSEN SYNCEN 25 24 23 22 21 20 19 18 27 17 28 TOP VIEW PLCC J28-1 1 2 16 15 14 3 13 4 12 5 6 7 8 9 GND BUS0 VCC Q1 PIN NAMES Pin VCCO BUS1 GND A0–A2 10 11 GND Q2 REN CLK A1 26 BUS2 SCAN S-IN TEN VEE VCCO ■ ■ ■ 1500ps max. clock to bus (data transmit) 1000ps max. clock to Q (data receive) Extended 100E VEE range of –4.2V to –5.5V 25Ω cutoff bus outputs 50Ω receiver outputs Scannable implementation of E336 Synchronous and asynchronous bus enables Non-inverting data path Bus outputs feature internal edge slow-down capacitors Additional package ground pins Fully compatible with industry standard 10KH, 100K ECL levels Internal 75KΩ input pulldown resistors Fully compatible with Motorola MC10E/100E337 Available in 28-pin PLCC package B1 ■ ■ DESCRIPTION A2 B2 ■ ■ ■ ■ ■ ■ ■ ■ ■ SY10E337 SY100E337 Function Data Inputs A B0–B2 Data Inputs B S-IN Serial (Scan) Data Input TEN, REN LOAD/HOLD Controls SCAN Scan Control ABUSDIS Asynchronous Bus Disable SBUSEN Synchronous Bus Enable SYNCEN Synchronous Enable Control CLK Clock BUS0–BUS2 25Ω Cutoff BUS Outputs Q0–Q2 Receive Data Outputs (Q2 serves as SCAN_OUT in scan mode) VCCO VCC to Output Rev.: C 1 Amendment: /2 Issue Date: February, 1998 SY10E337 SY100E337 Micrel BLOCK DIAGRAM BUS2 D D Q Q A2 B2 Q2 SCAN-OUT BUS1 D D Q Q Q1 A1 B1 BUS0 D Q SBUSEN D Q SYNCEN SET D A0 B0 S-IN TEN REN SCAN ABUSDIS CLK 2 Q Q0 SY10E337 SY100E337 Micrel DC ELECTRICAL CHARACTERISTICS VEE = VEE (Min.) to VEE (Max.); VCC = VCCO = GND TA = 0°C Symbol Parameter Min. VCUT Cut-off Output Voltage IIH Input HIGH Current All Other Inputs IEE Power Supply Current 10E 100E TA = +25°C Typ. Max. Min. Typ. Max. –2.03 –2.10 — TA = +85°C Min. Typ. –2.03 –2.10 Max. Unit Condition — –2.03 V 1 µA — mA — Unit Condition ps — ps — ps — ps — ps — –2.10 — — — 150 — — 150 — — 150 — — 145 145 174 174 — — 145 125 174 174 — — 145 167 174 200 NOTE: 1. Applies to BUS outputs only. Measured with VTT = –2.10V. AC ELECTRICAL CHARACTERISTICS VEE = VEE (Min.) to VEE (Max.); VCC = VCCO = GND TA = 0°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. tPLH tPHL Propagation Delay to Output CLK to Q CLK to BUS ABUSDIS SYNCEN 450 800 500 800 — — — — 1000 1800 1500 1800 450 800 500 800 — — — — 1000 1800 1500 1800 450 800 500 800 — — — — 1000 1800 1500 1800 tS Set-up Time BUS SBUSEN Data, S-IN TEN, REN, SCAN 350 100 400 550 — — — — — — — — 350 100 400 550 — — — — — — — — 350 100 400 550 — — — — — — — — Hold Time BUS SBUSEN Data, S-IN TEN, REN, SCAN 350 500 350 200 — — — — — — — — 350 500 350 200 — — — — — — — — 350 500 350 200 — — — — — — — — tPW Minimum Pulse Width 400 — — 400 — — 400 — — tr tf Rise/Fall Time 20% to 80% (Qn) 20% to 80% (BUSn Rise) 20% to 80% (BUSn Fall) 300 500 300 — — — 800 1000 800 300 500 300 — — — 800 1000 800 300 500 300 — — — 800 1000 800 tH PRODUCT ORDERING CODE Ordering Code Package Type Operating Range SY10E337JC J28-1 Commercial SY10E337JCTR J28-1 Commercial SY100E337JC J28-1 Commercial SY100E337JCTR J28-1 Commercial 3 SY10E337 SY100E337 Micrel 28 LEAD PLCC (J28-1) Rev. 03 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 2000 Micrel Incorporated 4