74AHC245; 74AHCT245
Octal bus transceiver; 3-state
Rev. 05 — 28 April 2009
Product data sheet
1. General description
The 74AHC245; 74AHCT245 is a high-speed Si-gate CMOS device.
The 74AHC245; 74AHCT245 is an octal transceiver featuring non-inverting 3-state bus
compatible outputs in both send and receive directions.
The 74AHC245; 74AHCT245 features 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 actions
Inputs accept voltages higher than V
CC
Input levels:
N
For 74AHC245: CMOS level
N
For 74AHCT245: TTL level
I
ESD protection:
N
HBM EIA/JESD22-A114E exceeds 2000 V
N
MM EIA/JESD22-A115-A exceeds 200 V
N
CDM EIA/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
74AHC245D
74AHCT245D
74AHC245PW
74AHCT245PW
74AHC245BQ
74AHCT245BQ
−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
74AHC245; 74AHCT245
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
74AHC_AHCT245_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 28 April 2009
2 of 16
NXP Semiconductors
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
5. Pinning information
5.1 Pinning
74AHC245
74AHCT245
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
001aak037
74AHC245
74AHCT245
A2
A3
A4
A5
A6
A7
GND 10
001aak038
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
74AHC_AHCT245_5
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. 05 — 28 April 2009
3 of 16
NXP Semiconductors
74AHC245; 74AHCT245
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.
74AHC_AHCT245_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 28 April 2009
4 of 16
NXP Semiconductors
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
8. Recommended operating conditions
Table 5.
74AHC245
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
74AHCT245
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
74AHC245
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
74AHC_AHCT245_5
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. 05 — 28 April 2009
5 of 16
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