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2 / 12 page Philips Semiconductors Product specification 74ABT543A Octal latched transceiver with dual enable (3-State) 2 1998 Sep 24 853-1794 20080 FEATURES • Combines 74ABT245 and 74ABT373 type functions in one device • 8-bit octal transceiver with D-type latch • Back-to-back registers for storage • Separate controls for data flow in each direction • Output capability: +64mA/–32mA • Live insertion/extraction permitted • Power-up 3-State • Power-up reset • Latch-up protection exceeds 500mA per Jedec Std 17 • ESD protection exceeds 2000 V per MIL STD 883 Method 3015 and 200 V per Machine Model DESCRIPTION The 74ABT543A high-performance BiCMOS device combines low static and dynamic power dissipation with high speed and high output drive. The 74ABT543A Octal Registered Transceiver contains two sets of D-type latches for temporary storage of data flowing in either direction. Separate Latch Enable (LEAB, LEBA) and Output Enable (OEAB, OEBA) inputs are provided for each register to permit independent control of data transfer in either direction. The outputs are guaranteed to sink 64mA. FUNCTIONAL DESCRIPTION The 74ABT543A contains two sets of eight D-type latches, with separate control pins for each set. Using data flow from A to B as an example, when the A-to-B Enable (EAB) input and the A-to-B Latch Enable (LEAB) input are Low the A-to-B path is transparent. A subsequent Low-to-High transition of the LEAB signal puts the A data into the latches where it is stored and the B outputs no longer change with the A inputs. With EAB and OEAB both Low, the 3-State B output buffers are active and display the data present at the outputs of the A latches. Control of data flow from B to A is similar, but using the EBA, LEBA, and OEBA inputs. QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS Tamb = 25°C; GND = 0V TYPICAL UNIT tPLH tPHL Propagation delay An to Bn or Bn to An CL = 50pF; VCC = 5V 2.9 3.6 ns CIN Input capacitance VI = 0V or VCC 4 pF CI/O I/O capacitance Outputs disabled; VO = 0V or VCC 7 pF ICCZ Total supply current Outputs disabled; VCC =5.5V 110 µA ORDERING INFORMATION PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER 24-Pin Plastic DIP –40 °C to +85°C 74ABT543A N 74ABT543A N SOT222-1 24-Pin plastic SO –40 °C to +85°C 74ABT543A D 74ABT543A D SOT137-1 24-Pin Plastic SSOP Type II –40 °C to +85°C 74ABT543A DB 74ABT543A DB SOT340-1 24-Pin Plastic TSSOP Type I –40 °C to +85°C 74ABT543A PW 7ABT543APW DH SOT355-1 PIN CONFIGURATION 24 23 22 21 20 19 18 17 16 10 15 9 8 7 6 5 4 3 2 1 VCC EBA B0 B1 B2 B3 B4 B5 B6 B7 OEBA A0 A1 A2 A3 A4 A5 A6 A7 LEBA 14 12 13 11 LEAB OEAB EAB GND SA00168 PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 14, 1 LEAB / LEBA A to B / B to A Latch Enable input (active-Low) 11, 23 EAB / EBA A to B / B to A Enable input (active-Low) 13, 2 OEAB / OEBA A to B / B to A Output Enable input (active-Low) 3, 4, 5, 6, 7, 8, 9, 10 A0 – A7 Port A, 3-State outputs 22, 21, 20, 19, 18, 17, 16, 15 B0 – B7 Port B, 3-State outputs 12 GND Ground (0V) 24 VCC Positive supply voltage |
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