74HC243U View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
74HC243U Datasheet PDF : 8 Pages
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Philips Semiconductors
Quad bus transceiver; 3-state
Product specification
74HC/HCT243
FEATURES
• Non-inverting 3-state outputs
• 2-way asynchronous data bus communication
• Output capability: bus driver
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT243 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT243 are quad bus transceivers featuring
non-inverting 3-state bus compatible outputs in both send
and receive directions.
They are designed for 4-line asynchronous 2-way data
communications between data buses.
The output enable inputs (OEA and OEB) can be used to
isolate the buses.
The “243” is similar to the “242” but has non-inverting (true)
outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL PARAMETER
CONDITIONS
tPHL/ tPLH
CI
CI/O
CPD
propagation delay
An to Bn;
Bn to An
input capacitance
CL = 15 pF; VCC = 5 V
input/output capacitance
power dissipation capacitance per transceiver notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
TYPICAL
HC
HCT
6
11
3.5
3.5
10
10
26
34
UNIT
ns
pF
pF
pF
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
2
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