SY10E336

Micrel, Inc. 3-BIT REGISTERED BUS TRANSCEIVER SY10E336 SY1S0YE10303E6336 SY100E336 FEATURES s 25Ω cutoff bus output s Extended 100E VEE range of –4.2V to –5.5V s 50Ω receiver output s Transmit and receive registers s 1500ps max. clock to bus s 1000ps max. clock to Q s Internal edge slow-down capacitors on bus outputs s Additional package ground pins s Fully compatible with industry standard 10KH, 100K ECL levels s Internal 75KΩ input pulldown resistors s Fully compatible with Motorola MC10E/100E336 s Available in 28-pin PLCC package BLOCK DIAGRAM DESCRIPTION The SY10/100E336 offer three bus transceivers with both transmit and receive registers and are 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 specified for 50Ω. The bus outputs feature a normal logic HIGH level (VOH) and a cutoff LOW level when at a logic LOW. At cutoff, the outputs go to –2.0V and the output emitter-follower is “off”, presenting a high impedance to the bus. The bus outputs have edge slow-down capacitors. The Transmit Enable pins (TEN) determine whether current data is held in the transmit register or new data is loaded from the A/B inputs. A logic LOW on both of the bus enable inputs (BUSEN), when clocked through the register, disables the bus outputs to –2.0V. The receiver section clocks bus data into the receive registers after gating with the Receive Enable (RXEN) input. All registers are clock...