74VHC245; 74VHCT245
Octal bus transceiver; 3-state
Rev. 01 — 25 August 2009
Product data sheet
1. General description
The 74VHC245; 74VHCT245 are high-speed Si-gate CMOS devices.
The 74VHC245; 74VHCT245 are octal transceivers featuring non-inverting 3-state bus
compatible outputs in both send and receive directions.
The 74VHC245; 74VHCT245 feature an output enable input (OE), for easy cascading,
and a send and receive direction control input (DIR).
OE controls the outputs so that the buses are effectively isolated.
2. Features
I
I
I
I
Balanced propagation delays
All inputs have Schmitt-trigger action
Inputs accept voltages higher than V
CC
Input levels:
N
The 74VHC245 operates with CMOS input level
N
The 74VHCT245 operates with TTL input level
I
ESD protection:
N
HBM JESD22-A114E exceeds 2000 V
N
MM JESD22-A115-A exceeds 200 V
N
CDM JESD22-C101C exceeds 1000 V
I
Multiple package options
I
Specified from
−40 °C
to +85
°C
and from
−40 °C
to +125
°C
3. Ordering information
Table 1.
Ordering information
Package
Temperature range
74VHC245D
74VHCT245D
74VHC245PW
74VHCT245PW
74VHC245BQ
74VHCT245BQ
−40 °C
to +125
°C
DHVQFN20
−40 °C
to +125
°C
TSSOP20
−40 °C
to +125
°C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
Version
SOT163-1
SOT360-1
Type number
plastic dual-in-line compatible thermal enhanced
SOT764-1
very thin quad flat package; no leads; 20 terminals;
body 2.5
×
4.5
×
0.85 mm
NXP Semiconductors
74VHC245; 74VHCT245
Octal bus transceiver; 3-state
4. Functional diagram
1
DIR
OE
19
2
A0
B0
18
3
A1
B1
17
19
B2
16
1
G3
3EN1
3EN2
4
A2
5
A3
B3
15
2
B4
14
3
4
B5
13
5
6
B6
12
7
8
B7
11
9
1
2
18
17
16
15
14
13
12
11
mna175
6
A4
7
A5
8
A6
9
A7
mna174
Fig 1.
Logic symbol
Fig 2.
IEC logic symbol
74VHC_VHCT245_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 25 August 2009
2 of 16
NXP Semiconductors
74VHC245; 74VHCT245
Octal bus transceiver; 3-state
5. Pinning information
5.1 Pinning
74VHC245
74VHCT245
terminal 1
index area
20 V
CC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
GND
(1)
GND 10
B7 11
13 B5
12 B6
DIR
2
3
4
5
6
7
8
9
1
A0
A1
DIR
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
20 V
CC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
001aak059
74VHC245
74VHCT245
A2
A3
A4
A5
A6
A7
GND 10
001aak060
Transparent top view
(1) The die substrate is attached to this pad using
conductive die attach material. It can not be used as
a supply pin or input.
Fig 3. Pin configuration SO20, TSSOP20
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
74VHC_VHCT245_1
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Description
direction control input
data input/output
data input/output
data input/output
data input/output
data input/output
data input/output
data input/output
data input/output
ground (0 V)
data input/output
data input/output
data input/output
data input/output
data input/output
data input/output
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 25 August 2009
3 of 16
NXP Semiconductors
74VHC245; 74VHCT245
Octal bus transceiver; 3-state
Table 2.
Symbol
B1
B0
OE
V
CC
Pin description
…continued
Pin
17
18
19
20
Description
data input/output
data input/output
output enable input (active LOW)
supply voltage
6. Functional description
Table 3.
Control
OE
L
L
H
[1]
H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
Function table
[1]
Input/output
DIR
L
H
X
An
A=B
inputs
Z
Bn
inputs
B=A
Z
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
V
I
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
[1]
[2]
Parameter
supply voltage
input voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
Conditions
Min
−0.5
−0.5
Max
+7.0
+7.0
-
+20
+25
+75
-
+150
500
Unit
V
V
mA
mA
mA
mA
mA
°C
mW
V
I
<
−0.5
V
V
O
<
−0.5
V or V
O
> V
CC
+ 0.5 V
V
O
=
−0.5
V to (V
CC
+ 0.5 V)
[1]
[1]
−20
−20
−25
-
−75
−65
T
amb
=
−40 °C
to +125
°C
[2]
-
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SO20 packages: above 70
°C
the value of P
tot
derates linearly at 8 mW/K.
For TSSOP20 packages: above 60
°C
the value of P
tot
derates linearly at 5.5 mW/K.
For DHVQFN20 packages: above 60
°C
the value of P
tot
derates linearly at 4.5 mW/K.
74VHC_VHCT245_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 25 August 2009
4 of 16
NXP Semiconductors
74VHC245; 74VHCT245
Octal bus transceiver; 3-state
8. Recommended operating conditions
Table 5.
74VHC245
V
CC
V
I
V
O
T
amb
∆t/∆V
supply voltage
input voltage
output voltage
ambient temperature
input transition rise and fall rate
V
CC
= 3.0 V to 3.6 V
V
CC
= 4.5 V to 5.5 V
74VHCT245
V
CC
V
I
V
O
T
amb
∆t/∆V
supply voltage
input voltage
output voltage
ambient temperature
input transition rise and fall rate
V
CC
= 4.5 V to 5.5 V
4.5
0
0
−40
-
5.0
-
-
+25
-
5.5
5.5
V
CC
+125
20
V
V
V
°C
ns/V
2.0
0
0
−40
-
-
5.0
-
-
+25
-
-
5.5
5.5
V
CC
+125
100
20
V
V
V
°C
ns/V
ns/V
Operating conditions
Conditions
Min
Typ
Max
Unit
Symbol Parameter
9. Static characteristics
Table 6.
Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
74VHC245
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V
V
CC
= 3.0 V
V
CC
= 5.5 V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V
V
CC
= 3.0 V
V
CC
= 5.5 V
V
OH
HIGH-level
V
I
= V
IH
or V
IL
output voltage
I
O
=
−50 µA;
V
CC
= 2.0 V
I
O
=
−50 µA;
V
CC
= 3.0 V
I
O
=
−50 µA;
V
CC
= 4.5 V
I
O
=
−4.0
mA; V
CC
= 3.0 V
I
O
=
−8.0
mA; V
CC
= 4.5 V
V
OL
LOW-level
V
I
= V
IH
or V
IL
output voltage
I
O
= 50
µA;
V
CC
= 2.0 V
I
O
= 50
µA;
V
CC
= 3.0 V
I
O
= 50
µA;
V
CC
= 4.5 V
I
O
= 4.0 mA; V
CC
= 3.0 V
I
O
= 8.0 mA; V
CC
= 4.5 V
74VHC_VHCT245_1
Conditions
Min
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.58
3.94
-
-
-
-
-
25
°C
Typ
-
-
-
-
-
-
2.0
3.0
4.5
-
-
0
0
0
-
-
Max
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.36
0.36
−40 °C
to +85
°C −40 °C
to +125
°C
Unit
Min
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.48
3.80
-
-
-
-
-
Max
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.44
0.44
Min
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.40
3.70
-
-
-
-
-
Max
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.55
0.55
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 25 August 2009
5 of 16
嵌入式系统
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