54ETL16245 Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – 16-Bit Data Transceiver with Incident Wave Switching

PRELIMINARY
May 1994
54 74ETL16245 16-Bit Data
Transceiver with Incident Wave Switching
General Description
The 54 74ETL16245 contains sixteen non-inverting bidirec-
tional buffers with TRI-STATE outputs designed with inci-
dent wave switching live insertion support and enhanced
noise margin for TTL backplane applications
Both the A and B ports include a bus hold circuit to latch the
output to the value last forced on that pin
The B port of this device includes 25X series output resis-
tors which minimize undershoot and ringing
Features
Y _{Supports the VME64 ETL specification}
Y _{Functionally and pin compatible with industry standard}
TTL 16245 SSOP pinout
Y _{Improved TTL-compatible input threshold range}
Y _{High drive TTL-compatible outputs (IOH} e b_{60 mA}
I_OL e 90 mA)
Y _{Supports 25X incident wave switching on the A port}
Y _{BiCMOS design significantly reduces power dissipation}
Y _{Distributed VCC and GND pin configuration minimizes}
high-speed switching noise
Y _{25X series-dampening resistor on B-port}
Y _{Available in 48-pin SSOP and ceramic flatpak}
Y _{Guaranteed output skew}
Y _{Guaranteed simultaneous switching noise level and}
dynamic threshold performance
Y _{Guaranteed latchup protection}
Logic Symbol
Connection Diagram
Pin Assignment for
SSOP and Flatpak
TL F 11654 – 1
Pin Description
Pin Names
DIR
OE
A_n
B_n
Description
Transmit Receive Input
Output Enable Input (Active LOW)
Backplane Bus Data
Local Bus Data
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 11654
TL F 11654 – 2
RRD-B30M105 Printed in U S A