Philips
Philips


74HC245

Octal bus transceiver 3-state


74HC245 Datasheet PDF
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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT245
Octal bus transceiver; 3-state
Product specification
File under Integrated Circuits, IC06
September 1993


74HC245 Datasheet PDF
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Philips Semiconductors
Octal bus transceiver; 3-state
Product specification
74HC/HCT245
FEATURES
Octal bidirectional bus interface
Non-inverting 3-state outputs
Output capability: bus driver
ICC category: MSI
GENERAL DESCRIPTIONS
The 74HC/HCT245 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/HCT245 are octal transceivers featuring
non-inverting 3-state bus compatible outputs in both send
and receive directions. The “245” features an output
enable (OE) input for easy cascading and a send/receive
(DIR) for direction control. OE controls the outputs so that
the buses are effectively isolated. The “245” is similar to
the “640” but has true (non-inverting) 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
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
TYPICAL
HC HCT
7 10
UNIT
ns
3.5 3.5 pF
10 10 pF
30 30 pF
September 1993
2


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Philips Semiconductors
Octal bus transceiver; 3-state
PIN DESCRIPTION
PIN NO.
1
2, 3, 4, 5, 6, 7, 8, 9
10
18, 17, 16, 15, 14, 13, 12, 11
19
20
SYMBOL
DIR
A0 to A7
GND
B0 to B7
OE
VCC
Product specification
74HC/HCT245
NAME AND FUNCTION
direction control
data inputs/outputs
ground (0 V)
data inputs/outputs
output enable input (active LOW)
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
September 1993
3


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Philips Semiconductors
Octal bus transceiver; 3-state
Product specification
74HC/HCT245
FUNCTION TABLE
INPUTS
OE DIR
LL
LH
HX
INPUTS/OUTPUTS
An
A=B
inputs
Z
Bn
inputs
B=A
Z
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
Fig.4 Functional diagram.
September 1993
4


74HC245 Datasheet PDF
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Philips Semiconductors
Octal bus transceiver; 3-state
Product specification
74HC/HCT245
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HC
+25
40 to +85
40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH
propagation delay
An to Bn;
Bn to An
25 90
9 18
7 15
115 135 ns 2.0 Fig.5
23 27
4.5
20 23
6.0
tPZH/ tPZL 3-state output enable time
30 150
190
225
2.0
OE to An;
11 30 38 45 ns 4.5 Fig.6
OE to Bn
9 26 33 38
6.0
signalname DIR
tPHZ/ tPLZ 3-state output disable time
41 150
190
225 ns 2.0
OE to An;
15 30 38 45
4.5 Fig.6
OE to Bn
12 26 33 38
6.0
signalname DIR
tTHL/ tTLH output transition time
14 60 75 90 ns 2.0 Fig.5
5 12 15 18
4.5
4 10 13 15
6.0
September 1993
5


74HC245 Datasheet PDF
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Philips Semiconductors
Octal bus transceiver; 3-state
Product specification
74HC/HCT245
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (ICC) for a unit load of 1 is given in the family specifications.
To determine ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
An
Bn
OE
DIR
UNIT LOAD COEFFICIENT
0.40
0.40
1.50
0.90
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
40 to +85
40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH
propagation delay
An to Bn;
Bn to An
12 22 28 33 ns 4.5 Fig.5
tPZH/ tPZL 3-state output enable time
16 30
38
45 ns 4.5 Fig.6
OE to An;
OE to Bn
signalname DIR
tPHZ/ tPLZ 3-state output disable time
16 30
38
45 ns 4.5 Fig.6
OE to An;
OE to Bn
signalname DIR
tTHL/ tTLH output transition time
5 12 15 18 ns 4.5 Fig.5
September 1993
6


74HC245 Datasheet PDF
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Philips Semiconductors
Octal bus transceiver; 3-state
AC WAVEFORMS
Product specification
74HC/HCT245
(1) HC : VM = 50%; VI = GND to VCC.
HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.5 Waveforms showing the input (An, Bn) to output (Bn, An) propagation delays and the output transition times.
(1) HC : VM = 50%; VI = GND to VCC.
HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.6 Waveforms showing the 3-state enable and disable times.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
September 1993
7




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