74HC245; 74HCT245
Octal bus transceiver; 3-state
Rev. 4 — 26 February 2016
Product data sheet
1. General description
The 74HC245; 74HCT245 is an 8-bit transceiver with 3-state outputs. The device features
an output enable (OE) and send/receive (DIR) for direction control. A HIGH on OE causes
the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes. This
enables the use of current limiting resistors to interface inputs to voltages in excess of
V
CC
.
2. Features and benefits
Complies with JEDEC standard JESD7A
Input levels:
For 74HC245: CMOS level
For 74HCT245: TTL level
Octal bidirectional bus interface
Non-inverting 3-state outputs
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from
40 C
to +85
C
and from
40 C
to +125
C
3. Ordering information
Table 1.
Ordering information
Package
Temperature range
74HC245D
74HCT245D
74HC245DB
74HCT245DB
74HC245PW
74HCT245PW
74HC245BQ
74HCT245BQ
40 C
to +125
C
DHVQFN20
40 C
to +125
C
TSSOP20
40 C
to +125
C
SSOP20
40 C
to +125
C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads; body
width 5.3 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
Version
SOT163-1
SOT339-1
SOT360-1
Type number
plastic dual-in-line compatible thermal enhanced very SOT764-1
thin quad flat package; no leads; 20 terminals; body
2.5
4.5
0.85 mm
Nexperia
74HC245; 74HCT245
Octal bus transceiver; 3-state
4. Functional diagram
Fig 1.
Logic symbol
Fig 2.
IEC logic symbol
74HC_HCT245
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 26 February 2016
2 of 18
Nexperia
74HC245; 74HCT245
Octal bus transceiver; 3-state
5. Pinning information
5.1 Pinning
(1) This is not a supply pin. The substrate is attached to this
pad using conductive die attach material. There is no
electrical or mechanical requirement to solder this pad.
However, if it is soldered, the solder land should remain
floating or be connected to GND.
Fig 3.
Pin configuration SO20 and (T)SSOP20
Fig 4.
Pin configuration DHVQFN20
5.2 Pin description
Table 2.
Symbol
DIR
A0, A1, A2, A3, A4, A5, A6, A7
GND
B7, B6, B5, B4, B3, B2, B1, B0
OE
V
CC
Pin description
Pin
1
2, 3, 4, 5, 6, 7, 8, 9
10
11, 12, 13, 14, 15, 16, 17, 18
19
20
Description
direction control
data input/output
ground (0 V)
data input/output
output enable input (active LOW)
supply voltage
74HC_HCT245
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 26 February 2016
3 of 18
Nexperia
74HC245; 74HCT245
Octal bus transceiver; 3-state
6. Functional description
6.1 Function table
Table 3.
Input
OE
L
L
H
[1]
Function table
[1]
Input/output
DIR
L
H
X
An
A=B
input
Z
Bn
input
B=A
Z
H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
SO20, SSOP20, TSSOP20 and
DHVQFN20 packages
[1]
Conditions
V
I
<
0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
0.5
V or V
O
> V
CC
+ 0.5 V
0.5
V < V
O
< V
CC
+ 0.5 V
Min
0.5
-
-
-
-
70
65
-
Max
+7
20
20
35
70
-
+150
500
Unit
V
mA
mA
mA
mA
mA
C
mW
[1]
For SO20 packages: above 70
C,
P
tot
derates linearly with 8 mW/K.
For SSOP20 and TSSOP20 packages: above 60
C,
P
tot
derates linearly with 5.5 mW/K.
For DHVQFN20 packages: above 60
C,
P
tot
derates linearly with 4.5 mW/K.
8. Recommended operating conditions
Table 5.
Recommended operating conditions
Conditions
Min
V
CC
V
I
V
O
t/V
supply voltage
input voltage
output voltage
input transition rise and
fall rate
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
T
amb
ambient temperature
2.0
0
0
-
-
-
40
74HC245
Typ
5.0
-
-
-
1.67
-
+25
Max
6.0
V
CC
V
CC
625
139
83
+125
Min
4.5
0
0
-
-
-
40
74HCT245
Typ
5.0
-
-
-
1.67
-
+25
Max
5.5
V
CC
V
CC
-
139
-
+125
V
V
V
ns/V
ns/V
ns/V
C
Unit
Symbol Parameter
74HC_HCT245
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 26 February 2016
4 of 18
Nexperia
74HC245; 74HCT245
Octal bus transceiver; 3-state
9. Static characteristics
Table 6.
Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
74HC245
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
OH
HIGH-level
V
I
= V
IH
or V
IL
output voltage
I
O
=
20 A;
V
CC
= 2.0 V
I
O
=
20 A;
V
CC
= 4.5 V
I
O
=
20 A;
V
CC
= 6.0 V
I
O
=
6.0
mA; V
CC
= 4.5 V
I
O
=
7.8
mA; V
CC
= 6.0 V
V
OL
LOW-level
V
I
= V
IH
or V
IL
output voltage
I
O
= 20
A;
V
CC
= 2.0 V
I
O
= 20
A;
V
CC
= 4.5 V
I
O
= 20
A;
V
CC
= 6.0 V
I
O
= 6.0 mA; V
CC
= 4.5 V
I
O
= 7.8 mA; V
CC
= 6.0 V
I
I
I
OZ
I
CC
C
I
C
I/O
input leakage
current
OFF-state
output current
V
I
= V
CC
or GND;
V
CC
= 6.0 V
V
I
= V
IH
or V
IL
; V
CC
= 6.0 V;
V
O
= V
CC
or GND
1.5
3.15
4.2
-
-
-
1.9
4.4
5.9
1.2
2.4
3.2
0.8
2.1
2.8
2.0
4.5
6.0
-
-
-
0.5
1.35
1.8
-
-
-
-
-
0.1
0.1
0.1
0.26
0.26
0.1
0.5
8.0
-
-
1.5
3.15
4.2
-
-
-
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
-
-
-
-
-
-
-
-
0.5
1.35
1.8
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
1.0
5.0
80
-
-
1.5
3.15
4.2
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
-
-
-
-
-
-
-
-
0.5
1.35
1.8
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
1.0
10
160
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A
pF
pF
Conditions
Min
25
C
Typ
Max
40 C
to +85
C 40 C
to +125
C
Unit
Min
Max
Min
Max
3.98 4.32
5.48 5.81
-
-
-
-
-
-
-
-
-
-
0
0
0
0.15
0.16
-
-
-
3.5
10
supply current V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 6.0 V
input
capacitance
input/output
capacitance
74HC_HCT245
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 4 — 26 February 2016
5 of 18
单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
