TL/F/11654
54/74ETL16245
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 (I
OH
eb60 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 V
CC
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
TL/F/11654–1
Pin Description
Pin Names Description
DIR Transmit/Receive Input
OE Output Enable Input (Active LOW)
A
n
Backplane Bus Data
B
n
Local Bus Data
Connection Diagram
Pin Assignment for
SSOP and Flatpak
TL/F/11654–2
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.