74AHC245; 74AHCT245
Octal bus transceiver; 3-state
Rev. 03 — 25 September 2007
Product data sheet
1. General description
The 74AHC/AHCT245 is a high-speed Si-gate CMOS device.
The 74AHC/AHCT245 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 (OE) input for easy cascading
and a send/receive (DIR) input for direction control.
OE controls the outputs so that the buses are effectively isolated.
2. Features
s
s
s
s
s
s
Balanced propagation delays
All inputs have a Schmitt-trigger action
Inputs accepts voltages higher than V
CC
For 74AHC245 only: operates with CMOS input levels
For 74AHCT245 only: operates with TTL input levels
ESD protection:
x
HBM JESD22-A114E exceeds 2000 V
x
MM JESD22-A115-A exceeds 200 V
x
CDM JESD22-C101C exceeds 1000 V
s
Multiple package options
s
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
plastic dual-in-line compatible thermal enhanced
very thin quad flat package no leads; 20 terminals;
body 2.5
×
4.5
×
0.85 mm
Version
SOT163-1
SOT360-1
SOT764-1
Type number
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_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 25 September 2007
2 of 16
NXP Semiconductors
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
5. Pinning information
5.1 Pinning
terminal 1
index area
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
GND 10
12 B6
11 B7
001aac431
2
3
4
5
20 V
CC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
B7 11
A2
A3
A4
A5
A6
A7
6
7
8
9
GND
(1)
245
13 B5
1
DIR
245
GND 10
001aac432
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
A[0:7]
B[0:7]
GND
OE
V
CC
Pin description
Pin
1
2, 3, 4, 5, 6, 7, 8, 9
18, 17, 16, 15, 14, 13, 12, 11
10
19
20
Description
direction control
data input/output
data input/output
ground (0 V)
output enable input (active LOW)
supply voltage
74AHC_AHCT245_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 25 September 2007
3 of 16
NXP Semiconductors
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
6. Functional description
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
V
I
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
SO20 package
TSSOP20 package
DHVQFN20 package
[1]
[2]
[3]
[4]
Conditions
Min
−0.5
−0.5
Max
+7.0
+7.0
-
±20
±25
75
-
+150
500
500
500
Unit
V
V
mA
mA
mA
mA
mA
°C
mW
mW
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
-
-
-
−75
−65
T
amb
=
−40 °C
to +125
°C
[2]
[3]
[4]
-
-
-
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
P
tot
derates linearly with 8 mW/K above 70
°C.
P
tot
derates linearly with 5.5 mW/K above 60
°C.
P
tot
derates linearly with 4.5 mW/K above 60
°C.
74AHC_AHCT245_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 25 September 2007
4 of 16
NXP Semiconductors
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
8. Recommended operating conditions
Table 5.
Recommended operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
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
= 3.3 V
±
0.3 V
V
CC
= 5.0 V
±
0.5 V
Conditions
Min
2.0
0
0
−40
-
-
74AHC245
Typ
5.0
-
-
+25
-
-
Max
5.5
5.5
V
CC
+125
100
20
Min
4.5
0
0
−40
-
-
74AHCT245
Typ
5.0
-
-
+25
-
-
Max
5.5
5.5
V
CC
+125
-
20
V
V
V
°C
ns/V
ns/V
Unit
9. Static characteristics
Table 6.
Static characteristics
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
For type 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
I
OZ
OFF-state
V
I
= V
IH
or V
IL
;
output current V
O
= V
CC
or GND;
V
CC
= 5.5 V
input leakage
current
V
I
= V
CC
or GND; V
CC
=
5.5 V
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.58
3.94
-
-
-
-
-
-
-
-
-
-
-
-
2.0
3.0
4.5
-
-
0
0
0
-
-
-
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.36
0.36
±0.25
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.48
3.8
-
-
-
-
-
-
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.44
0.44
±2.5
1.5
2.1
3.85
-
-
-
1.9
2.9
4.4
2.40
3.70
-
-
-
-
-
-
-
-
-
0.5
0.9
1.65
-
-
-
-
-
0.1
0.1
0.1
0.55
0.55
±10.0
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
µA
Conditions
Min
25
°C
Typ
Max
−40 °C
to +85
°C −40 °C
to +125
°C
Unit
Min
Max
Min
Max
I
I
I
CC
-
-
-
-
0.1
4.0
-
-
1.0
40
-
-
2.0
80
µA
µA
supply current V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 5.5 V
74AHC_AHCT245_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 25 September 2007
5 of 16
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