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Philips

74F621 Datasheet Preview

74F621 Datasheet

Octal bus transceiver / non-inverting open collector

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INTEGRATED CIRCUITS
74F621
Octal bus transceiver, non-inverting
(open collector)
Product specification
IC15 Data Handbook
1996 Jan 05
Philips
Semiconductors




Philips

74F621 Datasheet Preview

74F621 Datasheet

Octal bus transceiver / non-inverting open collector

No Preview Available !

Philips Semiconductors
Octal bus transceiver, non-inverting (open collector)
Product specification
74F621
FEATURES
High-impedance NPN base inputs for reduced loading
(20µA in High and Low states)
Octal bidirectional bus interface
Open collector outputs sink 64mA
Non-inverting
DESCRIPTION
The 74F621 is an octal transceiver featuring non-inverting open
collector bus-compatible outputs in both send and receive
directions. The outputs are capable of sinking 64mA, providing very
good capacitive drive characteristics.
This octal bus transceiver is designed for asynchronous two-way
communication between data buses. The control function
implementation allows for maximum flexibility in timing.
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 levels at the
Enable inputs (OEBA and OEAB). The Enable inputs can be used to
disable the device so that the buses are effectively isolated.
The dual-enable configuration gives the 74F621 the capability to
store data by the simultaneous enabling of OEBA and OEAB. Each
output reinforces its input in this transceiver configuration. Thus,
when both control inputs are enabled and all other data sources to
the two sets of the bus lines are at high impedance, both sets of bus
lines (16 in all) will remain in their last states.
PIN CONFIGURATION
OEAB 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
20 VCC
19 OEBA
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
SF01135
TYPE
74F621
TYPICAL
PROPAGATION
DELAY
8.0ns
TYPICAL SUPPLY CURRENT
(TOTAL)
105mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
20-pin plastic DIP
N74F621N
20-pin plastic SOL
N74F621D
PKG
DWG #
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
A0 - A7, B0 - B7
Data inputs
1.0/0.033
OEBA, OEAB
Output Enable inputs
1.0/0.033
A0 - A7
Data outputs
OC/40
B0 - B7
Data outputs
OC/106.7
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state. OC = Open Collector.
LOAD VALUE
HIGH/LOW
20µA/20µA
20µA/20µA
OC/24mA
OC/64mA
1996 Jan 05
2 853–0380 16185


Part Number 74F621
Description Octal bus transceiver / non-inverting open collector
Maker Philips
PDF Download

74F621 Datasheet PDF






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