•Multiplexed 3-State I/O ports for bus oriented applications
•Built in cascading carry capability
•U/D pin to control direction of counting
•Separate pins for Master reset and Synchronous operation
•Center power pins to reduce effects of package inductance
•Count frequency 115MHz Typ
•Supply current 100mA Typ
•See 74F269 for 24-pin separate I/O port version
•See 74F779 for 16-pin version
DESCRIPTION
The 74F579 is a fully synchronous 8-stage Up/Down Counter with
multiplexed 3-State I/O ports for bus-oriented applications. It
features a preset capability for programmable operation, carry
look-ahead for easy cascading and a U/D
direction of counting. All state changes, except for the case of
asynchronous reset, are initiated by the rising edge of the clock.
TC
output is not recommended for use as a clock or asynchronous
XXHXXXXXXI/O0 to I/O7 in high impedance (PE disabled)
XXLHXXXHXI/O0 to I/O7 in high impedance
XXLHXXXLXFlip-flop output appears on I/On lines
LXXXXXXXXAsynchronous reset for all flip-flops
HLXXXXXX↑Synchronous reset for all flip-flops
HHLLXXXX↑Parallel load all flip-flops
HH(not LL)HXXX↑Hold
HH(not LL)XHXX↑Hold (TC held High)
HH(not LL)LLHX↑Count up
HH(not LL)LLLX↑Count down
H=High voltage level
L=Low voltage level
X=Don’t care
↑=Low-to-High clock transition
(not LL) =CS
and PE should never be Low voltage level at the same time.
(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
V
T
T
CC
IN
IN
O
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–65 to +150°C
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
MINTYP
V
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
I
CC
VCC = MIN,
=
IL
p
n
V
(VIL = 0.0V,
IH
for MR, CP inputs)
,
= MIN
= 4.5V
OH
OH
= –
= –
VCC = MIN,
p
IK
+ I
Input clamp voltageVCC = MIN, II = I
I/O
Input current
at maximum input voltage
High-level input current
Low-level input current
Off-state output current
+ I
IH
High-level voltage applied
Off-state output current
IL
Low-level voltage applied
Short-circuit output current
Supply current (total)I
3
n
othersVCC = MAX, VI = 7.0V100
except
I/O
n
n
I
CCH
CCL
I
CCZ
=
IL
VIH = MIN
VCC = MAX, VI = 5.5V1mA
VCC = MAX, VI = 2.7V20
VCC = MAX, VI = 0.5V–0.6mA
VCC = MAX, VO = 2.7V 70
VCC = MAX, VO = 0.5V–600
OL
=
,
VCC = MAX–60–150mA
VCC = MAX105145mA
±10%V
±5%V
CC
±10%V
±5%V
CC
±10%V
,
±5%V
CC
IK
2.5V
CC
2.73.4V
2.43.3V
CC
2.73.3V
CC
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 test, I
SO20: plastic small outline package; 20 leads; body width 7.5 mmSOT163-1
74F579
1992 May 04
12
Page 13
Philips SemiconductorsProduct specification
8-bit bidirectional binary counter (3-State)
NOTES
74F579
1992 May 04
13
Page 14
Philips SemiconductorsProduct specification
8-bit bidirectional binary counter (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]
74F579
[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:9397-750-05142
yyyy mmm dd
14
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