Page 1
74ALS645A/74ALS645A–1
Octal transceiver (3–State)
Product specification
IC05 Data Handbook
1991 Jun 03
INTEGRATED CIRCUITS
Page 2
Philips Semiconductors Product specification
74ALS645A/74ALS645A-1Octal transceiver (3-State)
2
1991 Jun 03 853–0597 02709
FEA TURES
•Octal bidirectional bus interface
•3-State buffer outputs sink 24mA and source 15mA
•Outputs are placed in high impedance state during power-off
conditions
•The -1 version sinks 48mA I
OL
within the +5% VCC range
DESCRIPTION
The 74ALS645A is an octal transceiver featuring non-inverting
3-State bus compatible outputs in both transmit and receive
directions. The device features an output enable (OE) input for easy
cascading and transmit/receive (R/T
) input for direction control.
The 74ALS645A-1 is the same as the 74ALS645A except that both
ports sink 48mA within the ±5% V
CC
range.
TYPE
TYPICAL
PROPAGATION
DELA Y
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS645A 7.0ns 34mA
74ALS645A-1 7.0ns 34mA
PIN CONFIGURATION
SF00198
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
V
CC
OE
B0
B1
B2
B3
B4
B6
B5
B7
ORDERING INFORMA TION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
DRAWING
NUMBER
20-pin plastic DIP
74ALS645AN,
74ALS645A-1N
SOT146-1
20-pin plastic SOL
74ALS645AD,
744ALS645A-1D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
A0 – A7, B0 – B7 Data inputs 1.0/1.0 20µA/0.1mA
OE Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA
T/R T ransmit/receive input 1.0/1.0 20µA/0.1mA
A0 – A7 A port outputs 750/240 15mA/24mA
B0 – B7 B port outputs 750/240 15mA/24mA
A0 – A7 A port outputs (-1 version) 750/480 15mA/48mA
B0 – B7 B port outputs (-1 version) 750/480 15mA/48mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
B2 B3 B4 B5
16 15 14 13
234
V
CC
= Pin 20
GND = Pin 10
SF00199
B1
17
B0
18
19
1
OE
T/R
A0 A1 A2 A3 A4 A5
567
B6 B7
12 11
A6 A7
89
IEC/IEEE SYMBOL
SC00097
G3
19
3EN1 [BA]
1
3EN2 [AB]
∇ 1
2 ∇
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
Page 3
Philips Semiconductors Product specification
74ALS645A/74ALS645A-1Octal transceiver (3-State)
1991 Jun 03
3
LOGIC DIAGRAM
SF00201
18
B0
17
B1
16
B2
15
B3
14
B4
13
B5
12
B6
11
B7
A0 A1 A2 A3 A4 A5 A6 A7
23456789
19
1
OE
T/R
VCC = Pin 20
GND = Pin 10
FUNCTION TABLE
INPUTS
OE T/R
OUTPUTS
L L Bus B data to Bus A
L H Bus A data to Bus B
H X Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL
PARAMETER RATING UNIT
V
CC
Supply voltage –0.5 to +7.0 V
V
IN
Input voltage –0.5 to +7.0 V
I
IN
Input current –30 to +5 mA
V
OUT
Voltage applied to output in High output state –0.5 to V
CC
V
pp
p
p
All versions 48 mA
I
OUT
Current applied to output in Low output state
-1 version 96 mA
T
amb
Operating free-air temperature range 0 to +70 °C
T
stg
Storage temperature range –65 to +150 °C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5.0 5.5 V
V
IH
High-level input voltage 2.0 V
V
IL
Low-level input voltage 0.8 V
I
IK
Input clamp current –18 mA
I
OH
High-level output current –15 mA
p
All versions 24 mA
IOLLow-level output current
-1 version 48
1
mA
T
amb
Operating free-air temperature range
0 +70 °C
NOTES:
1. The 48mA limit applies only under the condition of V
CC
= 5.0V ± 5%.
Page 4
Philips Semiconductors Product specification
74ALS645A/74ALS645A-1Octal transceiver (3-State)
1991 Jun 03
4
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN TYP
2
MAX
UNIT
VCC±10%, VIL = MAX,
IOH = –0.4mA V
CC
– 2 V
-
p
CC
,
IL
,
VIH = MIN
IOH = –3mA 2.4 3.2 V
VOHHigh level out ut voltage
VCC = MIN, VIL = MAX,
V
IH
= MIN
IOH = –15mA 2.0 V
VCC = MIN, VIL = MAX,
I
OL
= 12mA 0.25 0.40 V
-
p
All versions
CC
,
IL
,
VIH = MIN
I
OL
= 24mA 0.35 0.50 V
VOLLow level out ut voltage
-1 version
VCC = 4.75V , VIL = MAX,
V
IH
= MIN
I
OL
= 48mA 0.35 0.50 V
V
IK
Input clamp voltage VCC = MIN, II = I
IK
–0.73 –1.5 V
Input current at maxi-
OE or T/R VCC = MAX, VI = 7.0V 0.1 mA
I
I
mum input voltage
A or B ports VCC = MAX, VI = 5.5V 0.1 mA
I
IH
High-level input current
3
VCC = MAX, VI = 2.7V 20 µA
I
IL
Low-level input current
3
VCC = MAX, VI = 0.4V –0.1 mA
I
O
Output current
4
VCC = MAX, VO = 2.25V –30 –112 mA
I
CCH
28 45 mA
I
CC
Supply current (total)
I
CCL
VCC = MAX
40 55 mA
I
CCZ
44 58 mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at VCC = 5V, T
amb
= 25°C.
3. For I/O ports, the parameter I
IH
and IIL include the off-state current.
4. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL PARAMETER TEST CONDITION
T
amb
= 0°C to +70°C
V
CC
= +5.0V ± 10%
C
L
= 50pF, RL = 500Ω
UNIT
MIN MAX
t
PLH
t
PHL
Propagation delay
An to Bn, Bn to An
Waveform 1
2.0
2.0
10.0
10.0
ns
t
PZH
t
PZL
Output enable time
to High or Low level
Waveform 2
Waveform 3
3.0
3.0
20.0
20.0
ns
t
PHZ
t
PLZ
Output disable time
from High or Low level
Waveform 2
Waveform 3
2.0
4.0
10.0
15.0
ns
Page 5
Philips Semiconductors Product specification
74ALS645A/74ALS645A-1Octal transceiver (3-State)
1991 Jun 03
5
AC WAVEFORMS
For all waveforms, VM = 1.3V .
V
M
V
M
V
M
V
M
t
PHL
t
PLH
An, Bn
Bn, An
SC00096
Waveform 1. Propagation Delay for Non-inverting Outputs
V
M
V
M
V
M
t
PHZ
t
PZH
OE
An, Bn
VOH -0.3V
0V
SC00094
Waveform 2. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
V
M
V
M
V
M
t
PLZ
t
PZL
OE
An, Bn
V
OL
+0.3V
SC00095
3.5V
Waveform 3. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
t
w
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
NEGATIVE
PULSE
POSITIVE
PULSE
t
w
AMP (V)
0.3V
0.3V
t
THL (tf
f
)
INPUT PULSE REQUIREMENTS
Rep.Rate
t
w
t
TLHtTHL
1MHz
500ns
2.0ns 2.0ns
Input Pulse Definition
V
CC
Family
74ALS
D.U.T.
PULSE
GENERATOR
R
L
C
L
R
T
V
IN
V
OUT
Test Circuit for 3-State Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
t
THL (tf
)
t
TLH (tr
)
t
TLH (tr
)
AMP (V)
Amplitude
3.5V
1.3V
V
M
SC00072
R
L
7.0V
SWITCH POSITION
TEST SWITCH
t
PLZ
, t
PZL
closed
All other open
Page 6
Philips Semiconductors Product specification
74ALS645A/74ALS645A–1Octal transceiver (3–State)
1991 Jun 03
6
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
Page 7
Philips Semiconductors Product specification
74ALS645A/74ALS645A–1Octal transceiver (3–State)
1991 Jun 03
7
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
Page 8
Philips Semiconductors Product specification
74ALS645A/74ALS645A–1Octal transceiver (3–State)
1991 Jun 03
8
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code Date of release: 05-96
Document order number: 9397-750-03308
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
[1]
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
Data sheet status
[1] Please consult the most recently issued datasheet before initiating or completing a design.
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