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DATA SHEET
Product specification
File under Integrated Circuits, IC06
December 1990
INTEGRATED CIRCUITS
74HC/HCT7245
Octal bus Schmitt-trigger
transceiver; 3-state
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
December 1990
2
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
74HC/HCT7245
FEATURES
Octal bidirectional bus interface
Non-inverting 3-state outputs
Output capability: bus driver
I
CC
category: MSI
Schmitt-trigger action on all data
inputs
GENERAL DESCRIPTION
The 74HC/HCT7245 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/HCT7245 are octal
transceivers featuring non-inverting
3-state bus compatible outputs in
both send and receive directions. The
"7245" features an output enable
(OE) input for easy cascading and a
send/receive input (DIR) for direction
control. OE controls the outputs so
that the buses are effectively isolated.
The 74HC/HCT7245 have
Schmitt-trigger inputs. These inputs
are capable of transforming slowly
changing input signals into sharply
defined jitter-free output signals.
The "7245" is identical to the "245" but
has hysteresis on the data inputs.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don't care
Z = high impedance OFF-state
INPUTS
INPUTS/OUTPUTS
OE
DIR
A
n
B
n
L
L
H
L
H
X
A = B
inputs
Z
inputs
B = A
Z
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
C; t
r
= t
f
= 6 ns
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
W):
P
D
= C
PD
V
CC
2
f
i
+
(C
L
V
CC
2
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
(C
L
V
CC
2
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
-
1.5 V
ORDERING INFORMATION
See
"74HC/HCT/HCU/HCMOS Logic Package Information"
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
propagation delay A
n
to B
n
C
L
= 15 pF; V
CC
= 5 V
8
12
ns
C
I
input capacitance
3.5
3.5
pF
C
I/O
input/output capacitance
10
10
pF
C
PD
power dissipation capacitance per transceiver
notes 1 and 2
40
40
pF
December 1990
3
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
74HC/HCT7245
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1
DIR
direction control
2, 3, 4, 5, 6, 7, 8, 9
A
0
to A
7
data inputs/outputs
10
GND
ground (0 V)
18, 17, 16, 15, 14, 13, 12, 11
B
0
to B
7
data inputs/outputs
19
OE
output enable input (active LOW)
20
V
CC
positive supply voltage
Fig.1 Pin configuration.
alfpage
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A 0
GND
B7
OE
V
CC
A 1
A 2
A 3
A 4
A 5
A 6
A 7
B6
B5
B4
B3
B2
B1
B0
7245
MBA327
Fig.2 Functional diagram.
ge
MBA330
19
1
2
9
11
18
B7
OE
DIR
B0
A7
A0
Fig.3 IEC logic symbol.
age
MBA404
11
12
13
14
15
16
17
18
2
1
3
2
4
5
6
7
8
9
19
1
G3
3EN1
3EN2
December 1990
4
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
74HC/HCT7245
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
"74HC/HCT/HCU/HCMOS Logic Family Specifications"
.
Output capability: bus driver
I
CC
category: MSI
TRANSFER CHARACTERISTICS FOR 74HC
Voltages are referred to GND (ground = 0 V)
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
SYMBOL
PARAMETER
T
amb
(
C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+
25
-
40 to
+
85
-
40 to
+
125
min.
typ.
max. min.
max.
min. max.
V
T
+
positive-going threshold
1.50
3.15
4.20
1.50
3.15
4.20
1.50
3.15
4.20
V
2.0
4.5
6.0
Figs. 4 and 5
V
T
-
negative-going threshold
0.30
1.35
1.80
0.30
1.35
1.80
0.30
1.35
1.80
V
2.0
4.5
6.0
Figs. 4 and 5
V
H
hysteresis (V
T
+
-
V
T
-
)
0.1
0.25
0.3
0.2
0.4
0.5
0.1
0.25
0.3
0.1
0.25
0.3
V
2.0
4.5
6.0
Figs. 4 and 5
SYMBOL
PARAMETER
T
amb
(
C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+
25
-
40 to
+
85
-
40 to
+
125
min. typ. max.
min.
max.
min.
max.
t
PHL
/ t
PLH
propagation delay
A
n
to B
n
;
B
n
to A
n
33
12
10
100
20
17
125
25
21
150
30
26
ns
2.0
4.5
6.0
Fig.7
t
PZH
/ t
PZL
3-state output enable time
OE to A
n
;
OE to B
n
47
17
14
160
32
27
200
40
34
240
48
41
ns
2.0
4.5
6.0
Fig.7
t
PHZ
/ t
PLZ
3-state output disable time
OE to A
n
;
OE to B
n
52
19
16
160
32
27
200
40
34
240
48
41
ns
2.0
4.5
6.0
Fig.7
t
THL
/ t
TLH
output transition time
14
5
4
60
12
10
75
15
13
90
18
15
ns
2.0
4.5
6.0
Fig.7
December 1990
5
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
74HC/HCT7245
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
"74HC/HCT/HCU/HCMOS Logic Family Specifications"
.
Output capability: bus driver
I
CC
category: MSI
Note to HCT types
The value of additional quiescent supply current (
I
CC
) for a unit load of 1 is given in the family specifications.
To determine
I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
INPUT
UNIT LOAD COEFFICIENT
A
n
B
n
OE
DIR
0.33
0.33
1.50
1.00
SYMBOL
PARAMETER
T
amb
(
C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+
25
-
40 to
+
85
-
40 to
+
125
min.
typ.
max. min.
max.
min. max.
V
T
+
positive-going threshold
2.0
2.1
2.0
2.1
2.0
2.1
V
4.5
5.5
Figs. 4 and 5
V
T
-
negative-going threshold
0.7
0.8
0.64
0.74
0.6
0.7
V
4.5
5.5
Figs. 4 and 5
V
H
hysteresis (V
T
+
-
V
T
-
)
0.17
0.17
0.23
0.23
V
4.5
5.5
Figs. 4 and 5
Document Outline
- FEATURES
- GENERAL DESCRIPTION
- FUNCTION TABLE
- QUICK REFERENCE DATA
- ORDERING INFORMATION
- PIN DESCRIPTION
- DC CHARACTERISTICS FOR 74HC
- TRANSFER CHARACTERISTICS FOR 74HC
- AC CHARACTERISTICS FOR 74HC
- DC CHARACTERISTICS FOR 74HCT
- TRANSFER CHARACTERISTICS FOR 74HCT
- AC CHARACTERISTICS FOR 74HCT
- TRANSFER CHARACTERISTIC WAVEFORMS
- AC WAVEFORMS
- PACKAGE OUTLINES
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