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54LS245FMQB Fiches technique(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce 54LS245FMQB
Description  TRI-STATE Octal Bus Transceiver
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

54LS245FMQB Fiches technique(HTML) 1 Page - National Semiconductor (TI)

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TLF6413
June 1989
54LS245DM54LS245DM74LS245
TRI-STATE
Octal Bus Transceiver
General Description
These octal bus transceivers are designed for asynchro-
nous two-way communication between data buses The
control function implementation minimizes external timing
requirements
The device allows data transmission from the A bus to the B
bus or from the B bus to the A bus depending upon the logic
level at the direction control (DIR) input The enable input
(G) can be used to disable the device so that the buses are
effectively isolated
Features
Y
Bi-Directional bus transceiver in a high-density 20-pin
package
Y
TRI-STATE outputs drive bus lines directly
Y
PNP inputs reduce DC loading on bus lines
Y
Hysteresis at bus inputs improve noise margins
Y
Typical propagation delay times port-to-port 8 ns
Y
Typical enabledisable times 17 ns
Y
IOL (sink current)
54LS
12 mA
74LS
24 mA
Y
IOH (source current)
54LS
b
12 mA
74LS
b
15 mA
Y
Alternate MilitaryAerospace device (54LS245) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TLF6413 – 1
Order Number 54LS245DMQB 54LS245FMQB 54LS245LMQB
DM54LS245J DM54LS245W DM74LS245WM or DM74LS245N
See NS Package Number E20A J20A M20B N20A or W20A
Function Table
Enable
Direction
Operation
G
Control
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
H e High Level L e Low Level X e Irrelevant
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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