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/HCT7245
Octal bus Schmitt-trigger
transceiver; 3-state
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
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.
74HC/HCT7245
The “7245” is identical to the “245” but
has hysteresis on the data inputs.
FUNCTION TABLE
INPUTS
OE
L
L
H
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
DIR
L
H
X
INPUTS/OUTPUTS
A
n
A=B
inputs
Z
B
n
inputs
B=A
Z
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
= 6 ns
TYPICAL
SYMBOL
t
PHL
/ t
PLH
C
I
C
I/O
C
PD
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
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”.
PARAMETER
propagation delay A
n
to B
n
input capacitance
input/output capacitance
power dissipation capacitance per transceiver
notes 1 and 2
CONDITIONS
HC
C
L
= 15 pF; V
CC
= 5 V
8
3.5
10
40
HCT
12
3.5
10
40
ns
pF
pF
pF
UNIT
December 1990
2
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger 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
A
0
to A
7
GND
B
0
to B
7
OE
V
CC
NAME AND FUNCTION
direction control
data inputs/outputs
ground (0 V)
data inputs/outputs
74HC/HCT7245
output enable input (active LOW)
positive supply voltage
alfpage
ge
DIR
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
20 VCC
19 OE
19
OE
age
19
1
1
18 B 0
17 B 1
16 B 2
2
DIR
G3
3EN1
3EN2
A0
B0
18
2
3
4
5
1
2
18
17
16
15
14
13
12
11
MBA404
7245
6
7
8
9
15 B 3
14 B 4
13 B 5
12 B 6
11 B 7
MBA327
MBA330
9
A7
B7
6
11
7
8
9
GND 10
Fig.1 Pin configuration.
Fig.2 Functional diagram.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
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)
T
amb
(°C)
74HC
SYMBOL PARAMETER
min.
V
T+
positive-going threshold
+25
−40
to
+85
−40
to
+125
74HC/HCT7245
TEST CONDITIONS
UNIT V
CC
WAVEFORMS
(V)
V
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
Figs. 4 and 5
typ. max. min. max. min. max.
1.50
3.15
4.20
1.50
3.15
4.20
0.30
1.35
1.80
0.2
0.4
0.5
0.1
0.25
0.3
0.30
1.35
1.80
0.1
0.25
0.3
1.50
3.15
4.20
V
T−
negative-going threshold
0.30
1.35
1.80
0.1
0.25
0.3
V
Figs. 4 and 5
V
H
hysteresis (V
T+
−
V
T−
)
V
Figs. 4 and 5
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
T
amb
(°C)
74HC
SYMBOL
PARAMETER
+25
−40
to
+85
−40
to
+125
max.
150
30
26
240
48
41
240
48
41
90
18
15
ns
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
Fig.7
UNIT V
CC
WAVEFORMS
(V)
TEST CONDITIONS
min. typ. max. min. max. min.
t
PHL
/ t
PLH
propagation delay
A
n
to B
n
;
B
n
to A
n
3-state output enable time
OE to A
n
;
OE to B
n
3-state output disable time
OE to A
n
;
OE to B
n
output transition time
33
12
10
47
17
14
52
19
16
14
5
4
100
20
17
160
32
27
160
32
27
60
12
10
125
25
21
200
40
34
200
40
34
75
15
13
t
PZH
/ t
PZL
ns
Fig.7
t
PHZ
/ t
PLZ
ns
Fig.7
t
THL
/ t
TLH
ns
Fig.7
December 1990
4
Philips Semiconductors
Product specification
Octal bus Schmitt-trigger transceiver;
3-state
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
74HC/HCT7245
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.
INPUT
A
n
B
n
OE
DIR
UNIT LOAD COEFFICIENT
0.33
0.33
1.50
1.00
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
T
amb
(°C)
74HCT
SYMBOL PARAMETER
min.
V
T+
V
T−
V
H
positive-going threshold
negative-going threshold
hysteresis (V
T+
−
V
T−
)
0.7
0.8
0.17
0.17
0.23
0.23
+25
−40
to
+85
−40
to
+125
UNIT V
CC
WAVEFORMS
(V)
V
V
V
4.5
5.5
4.5
5.5
4.5
5.5
Figs. 4 and 5
Figs. 4 and 5
Figs. 4 and 5
TEST CONDITIONS
typ. max. min. max. min. max.
2.0
2.1
0.64
0.74
2.0
2.1
0.6
0.7
2.0
2.1
December 1990
5
