INTEGRATED CIRCUITS
74ABT245
Octal transceiver with direction pin
(3-State)
Product data
Supersedes data of 1998 Jan 16
2003 Feb 06
Philips
Semiconductors
Philips Semiconductors
Product data
Octal transceiver with direction pin (3-State)
74ABT245
FEATURES
•
Octal bidirectional bus interface
•
3-State buffers
•
Output capability: +64 mA/–32 mA
•
Latch-up protection exceeds 500 mA per Jedec Std 17
•
ESD protection exceeds 2000 V per MIL STD 833 Method 3015
and 200 V per Machine Model
DESCRIPTION
The 74ABT245 high-performance BiCMOS device combines low
static and dynamic power dissipation with high speed and high
output drive.
The 74ABT245 device is an octal transceiver featuring non-inverting
3-State bus compatible outputs in both send and receive directions.
The control function implementation minimizes external timing
requirements. The device features an Output Enable (OE) input for
easy cascading and a Direction (DIR) input for direction control.
•
Power-up 3-State
•
Live insertion/extraction permitted
•
Inputs are disabled during 3-State mode
QUICK REFERENCE DATA
SYMBOL
t
PLH
t
PHL
C
IN
C
I/O
I
CCZ
PARAMETER
Propagation delay
An to Bn or Bn to An
Input capacitance DIR, OE
I/O pin capacitance
Total supply current
CONDITIONS
T
amb
= 25
°C;
GND = 0 V
C
L
= 50 pF; V
CC
= 5 V
V
I
= 0 V or V
CC
Outputs disabled; V
O
= 0 V or V
CC
Outputs disabled; V
CC
=5.5 V
TYPICAL
2.2
2.9
4
7
50
UNIT
ns
pF
pF
µA
ORDERING INFORMATION
PACKAGES
20-Pin plastic SO
20-Pin Plastic SSOP Type II
20-Pin Plastic TSSOP Type I
TEMPERATURE RANGE
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
PART NUMBER
74ABT245D
74ABT245DB
74ABT245PW
DWG NUMBER
SOT163-1
SOT339-1
SOT360-1
PIN CONFIGURATION
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
PIN DESCRIPTION
PIN
NUMBER
1
2, 3, 4, 5,
6, 7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
19
10
20
SYMBOL
DIR
A0 – A7
B0 – B7
OE
GND
V
CC
NAME AND FUNCTION
Direction control input
Data inputs/outputs (A side)
Data inputs/outputs (B side)
Output enable input (active-LOW)
Ground (0 V)
Positive supply voltage
GND 10
SA00121
2003 Feb 06
2
Philips Semiconductors
Product data
Octal transceiver with direction pin (3-State)
74ABT245
LOGIC SYMBOL
1
DIR
19
2
18
A1
3
17
A2
4
16
A3
5
15
A4
6
14
A5
7
13
A6
8
12
A7
9
11
B7
B6
B5
B4
B3
B2
B1
B0
LOGIC SYMBOL (IEEE/IEC)
19
OE
G3
3 EN1 (BA)
1
3 EN2 (AB)
A0
1
2
3
4
5
6
7
8
9
2
18
17
16
15
14
13
12
11
SA00122
SA00123
FUNCTION TABLE
INPUTS
OE
L
L
H
H
L
X
Z
DIR
L
H
X
INPUTS/OUTPUTS
An
An = Bn
Inputs
Z
Bn
Inputs
Bn = An
Z
= High voltage level
= Low voltage level
= Don’t care
= High impedance “off” state
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
V
CC
I
IK
V
I
I
OK
V
OUT
I
OUT
T
stg
PARAMETER
DC supply voltage
DC input diode current
DC input voltage
3
DC output diode current
DC output voltage
3
DC output current
Storage temperature range
V
O
< 0
output in Off or High state
output in Low state
V
I
< 0
CONDITIONS
RATING
–0.5 to +7.0
–18
–1.2 to +7.0
–50
–0.5 to +5.5
128
–65 to 150
UNIT
V
mA
V
mA
V
mA
°C
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150
°C.
3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2003 Feb 06
3
Philips Semiconductors
Product data
Octal transceiver with direction pin (3-State)
74ABT245
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
V
CC
V
I
V
IH
V
IL
I
OH
I
OL
∆t/∆v
T
amb
DC supply voltage
Input voltage
HIGH-level input voltage
LOW-level Input voltage
HIGH-level output current
LOW-level output current
Input transition rise or fall rate
Operating free-air temperature range
0
–40
PARAMETER
Min
4.5
0
2.0
0.8
–32
64
5
+85
Max
5.5
V
CC
UNIT
V
V
V
V
mA
mA
ns/V
°C
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
T
amb
= +25
°C
Min
V
IK
V
OH
V
OL
I
I
I
OFF
I
PU
/I
PD
I
IH
+ I
OZH
I
IL
+ I
OZL
I
CEX
I
O
I
CCH
I
CCL
I
CCZ
Quiescent supply current
Input clamp voltage
V
CC
= 4.5 V; I
IK
= –18 mA
V
CC
= 4.5 V; I
OH
= –3 mA; V
I
= V
IL
or V
IH
High-level output voltage
V
CC
= 5.0 V; I
OH
= –3 mA; V
I
= V
IL
or V
IH
V
CC
= 4.5 V; I
OH
= –32 mA; V
I
= V
IL
or V
IH
Low-level output voltage
Input leakage
g
current
Control pins
Data pins
V
CC
= 4.5 V; I
OL
= 64 mA; V
I
= V
IL
or V
IH
V
CC
= 5.5 V; V
I
= GND or 5.5 V
V
CC
= 5.5 V; V
I
= GND or 5.5 V
V
CC
= 0.0 V; V
I
or V
O
≤
4.5 V
V
CC
= 2.0 V; V
O
= 0.5 V; V
I
= GND or V
CC
;
V
OE
= Don’t care
V
CC
= 5.5 V; V
O
= 2.7 V; V
I
= V
IL
or V
IH
V
CC
= 5.5 V; V
O
= 0.5 V; V
I
= V
IL
or V
IH
V
CC
= 5.5 V; V
O
= 5.5 V; V
I
= GND or V
CC
V
CC
= 5.5 V; V
O
= 2.5 V
V
CC
= 5.5 V; Outputs HIGH;
V
I
= GND or V
CC
V
CC
= 5.5 V; Outputs LOW;
V
I
= GND or V
CC
V
CC
= 5.5 V; Outputs 3-State;
V
I
= GND or V
CC
Outputs enabled, one input at 3.4 V, other
inputs at V
CC
or GND; V
CC
= 5.5 V
∆I
CC
Additional supply current per
input pin
2
Outputs 3-State, one data input at 3.4 V,
other inputs at V
CC
or GND; V
CC
= 5.5 V
Outputs 3-State, one enable input at 3.4 V,
other inputs at V
CC
or GND; V
CC
= 5.5 V
–40
2.5
3.0
2.0
Typ
–0.9
2.9
3.4
2.4
0.42
±0.01
±5
±5.0
±5.0
5.0
–5.0
5.0
–100
50
24
50
0.5
50
0.5
0.55
±1.0
±100
±100
±50
50
–50
50
–180
250
30
250
1.5
250
1.5
–40
Max
–1.2
2.5
3.0
2.0
0.55
±1.0
±100
±100
±50
50
–50
50
–180
250
30
250
1.5
250
1.5
T
amb
= –40
°C
to +85
°C
Min
Max
–1.2
V
V
V
V
V
µA
µA
µA
µA
µA
µA
µA
mA
µA
mA
µA
mA
µA
mA
UNIT
Power-off leakage current
Power-up/down 3-State
output current
3
3-State output High current
3-State output Low current
Output high leakage current
Output current
1
NOTES:
1. Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
2. This is the increase in supply current for each input at 3.4 V.
3. This parameter is valid for any V
CC
between 0 V and 2.1 V with a transition time of up to 10 msec. For V
CC
= 2.1 V to V
CC
= 5 V"10%, a
transition time of up to 100
µsec
is permitted.
2003 Feb 06
4
Philips Semiconductors
Product data
Octal transceiver with direction pin (3-State)
74ABT245
AC CHARACTERISTICS
GND = 0 V; t
R
= t
F
= 2.5 ns; C
L
= 50 pF, R
L
= 500
Ω
LIMITS
SYMBOL
PARAMETER
WAVEFORM
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
An to Bn or Bn to An
Output enable time
to HIGH and LOW level
Output disable time
from HIGH and LOW Level
1
2
2
1.0
1.0
1.3
2.3
1.0
1.0
T
amb
= +25
°C
V
CC
= +5.0 V
Typ
2.2
2.9
3.0
4.0
4.7
4.1
Max
4.1
4.2
4.8
5.8
6.2
5.8
T
amb
= –40
°C
to +85
°C
V
CC
= +5.0 V
±0.5
V
Min
1.0
1.0
1.3
2.3
1.0
1.0
Max
4.6
4.6
5.3
6.3
7.2
6.3
ns
ns
ns
UNIT
AC WAVEFORMS
V
M
= 1.5V, V
IN
= GND to 3.0V
nOE INPUT
An or Bn
INPUT
V
M
V
M
V
M
t
PZL
t
PLH
t
PHL
OUTPUT
V
M
Bn or An
OUTPUT
V
M
V
M
t
PZH
t
PHZ
V
OL
+ 0.3V
V
OL
V
OH
V
OH
– 0.3V
V
M
t
PLZ
3.5V
V
M
SA00124
OUTPUT
0V
Waveform 1. Waveforms showing the input to output
propagation delays
SA00024
Waveform 2. Waveforms showing the 3-State Output Enable
and Disable times
TEST CIRCUIT AND WAVEFORMS
7V
From Output
Under Test
C
L
= 50 pF
500
Ω
S1
Open
GND
500
Ω
Load Circuit
TEST
t
pd
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
open
7V
open
DEFINITIONS
Load capacitance includes jig and probe capacitance;
C
L
=
see AC CHARACTERISTICS for value.
SA00012
2003 Feb 06
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
