•High-impedance NPN base inputs for reduced loading
(70µA in High and Low states)
•Ideal for applications which require high-output drive and minimal
bus loading
•Inverting version of 74F245
•Octal bidirectional bus interface
•3-State outputs sink 64mA and source 15mA
DESCRIPTION
The 74F640 is an octal transceiver featuring inverting 3-State bus
compatible outputs in both transmit and receive directions. The B
port outputs are capable of sinking 64mA and sourcing 15mA,
providing very good capacitive drive characteristics. The device
features an Output Enable (OE
Transmit/Receiver (T/R
outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOAD VALUE
HIGH/LOW
1989 Nov 27853–0381 98171
2
Page 3
Philips SemiconductorsProduct specification
OUTPUTS
74F640Octal bus transceiver, inverting (3-State)
LOGIC SYMBOL
456
A2A3
A4 A5A67A7
B4 B5B6B7
19
1
VCC= Pin 20
GND = Pin 10
23
A0A1
OE
T/R
B0B1B2B3
181716 15 1413 1211
FUNCTION TABLE
INPUTS
OET/R
LLBus B data to Bus A
LHBus A data to Bus B
HXZ
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
89
SF01140
LOGIC SYMBOL (IEEE/IEC)
19
1
2
3
4
5
6
7
8
9
G3
3EN1(BA)
3EN2(AB)
1
2
18
17
16
15
14
13
12
11
SF01141
LOGIC DIAGRAM
19
OE
1
T/R
VCC= Pin 20
GND = Pin 10
1989 Nov 27
A0A1A4A5A6A7
23 4
18171615141312
B0B1B4B5B6B7
B2B3
A3A2
5678119
3
SF01142
Page 4
Philips SemiconductorsProduct specification
I
Current applied to output in Low output state
SYMBOL
PARAMETER
UNIT
IOHHigh-level output current
IOLLow-level output current
74F640Octal bus transceiver, inverting (3-State)
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits 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
V
V
I
IN
V
OUT
T
T
CC
IN
OUT
amb
stg
Supply voltage–0.5 to +7.0V
Input voltage –0.5 to +7.0V
Input current–30 to +5mA
Voltage applied to output in High output state–0.5 to +V
pp
p
Operating free-air temperature range0 to +70°C
Storage temperature range–65 to +150°C
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
SYMBOLPARAMETERTEST CONDITIONS
MIN
TYP
NO TAG
MAX
UNIT
V
IK
I
I
IH
I
IL
I
OZH+IIH
I
OZL+IIL
OS
I
CC
A0–A7
B0–B7
p
VCC = MIN,
=
IL
V
= MIN
IH
,
VCC = MIN,
=
p
IL
V
IH
,
= MIN,
Input clamp voltageVCC = MIN, II = I
OE,
VCC = 0.0V, VI = 7.0V100µA
Input current at maximum
input voltage
High-level input current
Low-level input current
Off-state output current,
High level of voltage applied
Off-state output current,
Low level of voltage applied
Short-circuit output cur-
NO TAG
rent
Supply current (total)
T/R
A0–A7,
B0–B7
OE,
only
A0–A7
B0–B7
I
CCH
I
CCL
I
CCZ
VCC = 5.5V, VI = 5.5V1.0mA
VCC = MAX, VI = 2.7V40µA
VCC = MAX, VI = 0.5V–40µA
VCC = MAX, VI = 2.7V70µA
VCC = MAX, VI = 0.5V–70µA
=
CC
VCC = MAX
= –
OH
= –
OH
=
OL
=
OL
IK
±10%V
±5%V
±10%V
±5%V
±10%V
±5%V
±10%V
±5%V
CC
CC
CC
CC
T/R = An = 4.5V,
OE = GND
T/R = Bn = OE = GND91120mA
T/R = Bn = GND,
OE = 4.5V
2.4V
CC
2.73.3V
2.0V
CC
2.0V
CC
0.350.50V
0.350.50V
CC
0.420.55V
–0.73–1.2V
–60–150mA
–100–225µA
6685mA
78102mA
0.55V
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 V
3. Not more than one output should be shorted at a time. For testing I
= 5V, T
CC
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
amb
= 25°C.
, the use of high-speed test apparatus and/or sample-and-hold
OS
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
tests should be performed last.
OS
1989 Nov 27
5
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Philips SemiconductorsProduct specification
74F640Octal bus transceiver, inverting (3-State)
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOLPARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
An to Bn, Bn to An
Output Enable time
to High or Low level
Output Disable time
from High or Low level
TEST
CONDITION
Waveform
NO TAG
Waveform 3
Waveform 2
Waveform 3
Waveform 2
VCC = +5V
T
= +25°C
amb
C
= 50pF, RL = 500Ω
L
MINTYPMAXMINMAX
2.0
1.0
5.5
5.5
2.0
2.0
4.5
2.5
6.5
7.0
3.5
4.5
7.0
5.0
10.5
10.5
6.5
7.0
VCC = +5V ± 10%
T
= 0°C to +70°C
amb
C
= 50pF, RL = 500Ω
L
2.0
1.0
5.0
5.0
1.5
2.0
8.0
5.5
12.0
11.0
8.0
7.5
UNIT
ns
ns
ns
1989 Nov 27
6
Page 7
Philips SemiconductorsProduct specification
74F640Octal bus transceiver, inverting (3-State)
AC WAVEFORMS
For all waveforms, VM = 1.5V.
OE
An, B
B
n,
V
n
A
n
V
t
PHL
M
V
M
V
t
PLH
M
An, Bn
V
M
M
t
PZL
V
M
t
PLZ
V
M
VOL+0.3V
SF00773
Waveform 1. Propagation Delay for Inverting Outputs
OE
V
M
t
PHZ
V
M
VOH–0.3V
SF00203
An, Bn
V
M
t
PZH
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
TEST CIRCUIT AND WAVEFORMS
V
CC
R
PULSE
GENERATOR
V
IN
R
T
D.U.T.
V
OUT
Test Circuit for Open Collector Outputs
SWITCH POSITION
TESTSWITCH
t
t
PLZ
PZL
closed
closed
All otheropen
L
R
C
L
L
7.0V
0V
NEGATIVE
PULSE
POSITIVE
PULSE
SF00204
Waveform 2. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
90%
10%
t
w
V
M
10%
t
V
90%
M
THL (tf
t
TLH (tr
)
)
t
t
t
w
TLH (tr
THL (tf
10%
)
)
90%
V
M
V
M
90%
10%
AMP (V)
0V
AMP (V)
0V
Input Pulse Definition
DEFINITIONS:
= Load resistor;
R
L
C
= Load capacitance includes jig and probe capacitance;
L
R
= Termination resistance should be equal to Z
T
1989 Nov 27
see AC electrical characteristics for value.
see AC electrical characteristics for value.
pulse generators.
SO20:plastic small outline package; 20 leads; body width 7.5 mmSOT163-1
74F640
1989 Nov 27
9
Page 10
Philips SemiconductorsProduct specification
Octal bus transceiver, inverting (3-State)
NOTES
74F640
1989 Nov 27
10
Page 11
Philips SemiconductorsProduct specification
Octal bus transceiver, inverting (3-State)
Data sheet status
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
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.
[1]
74F640
[1] Please consult the most recently issued datasheet before initiating or completing a design.
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 codeDate of release: 10-98
Document order number:9397-750-05148
yyyy mmm dd
11
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