Philips Semiconductors
Product specification
8-bit bidirectional binary counter (3-State)
74F579
FEATURES
•
Fully synchronous operation
•
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 115 MHz Typ
•
Supply current 100 mA 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 input to control the
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
reset due to the possibility of decoding spikes.
PIN CONFIGURATION
CP
I/O0
I/O1
I/O2
I/O3
GND
I/O4
I/O5
I/O6
I/O7
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
MR
SR
CEP
CET
VCC
TC
U/D
PE
CS
OE
SF01085
ORDERING INFORMATION
TYPE
74F579
TYPICAL f
MAX
115MHz
TYPICAL SUPPLY
CURRENT
(TOTAL)
100 mA
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic DIP
20-Pin Plastic SOL
COMMERCIAL RANGE
V
CC
= 5 V
±10%,
T
amb
= 0 to +70
°C
N74F579N
N74F579D
PKG DWG #
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
Data Inputs
I/O
n
PE
U/D
MR
SR
CEP
CET
CS
OE
CP
TC
Data Outputs
Parallel Enable input (active Low)
Up/Down count control input
Master Reset input (active Low)
Synchronous Reset input (active Low)
Count Enable Parallel input (active Low)
Count Enable Trickle input (active Low)
Chip Select input (active Low)
Output Enable input (active Low)
Clock input (active Rising Edge)
Terminal Count Output (active Low)
DESCRIPTION
74F(U.L.)
HIGH/LOW
3.5/1.0
150/40
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
50/33
LOAD VALUE
HIGH / LOW
70
µA
/ 0.6 mA
3.0 mA / 24 mA
20
µA/
0.6 mA
20
µA
/ 0.6 mA
20
µA
/ 0.6 mA
20
µA
/ 0.6 mA
20
µA
/ 0.6 mA
20
µA
/ 0.6 mA
20
µA
/ 0.6 mA
20
µA
/ 0.6 mA
20
µA/
0.6 mA
1.0 mA / 20 mA
NOTE:
One (1.0) FAST Unit Load (U.L.) is defined as: 20
µA
in the High state and 0.6 mA in the Low state.
2000 Dec 18
2
853-0377 25265
Philips Semiconductors
Product specification
8-bit bidirectional binary counter (3-State)
74F579
LOGIC SYMBOL
13
12
20
19
14
LOGIC SYMBOL (IEEE/IEC)
CTR DIV 256
19
12
1
1
13
11
TC
15
14
1
1
1
R1
u1
&
&
EN3
M4[DOWN]
1
17
1
M5[UP]
M2[LOAD]
1
18
17
11
CP
CEP
CET
OE
I/O0
PE
CS
MR
SR
U/D
I/O1
I/O2
I/O3
I/O4
I/O5 I/O6
I/O7
EN6
&
G7
2
V
CC
= Pin 16
GND = Pin 6
3
4
5
7
8
9
10
18
1
2,5,7, +/C8
2,4,7–
R9
[1]
[2]
[4]
[8]
[16]
[32]
[64]
[128]
3,5,6,8 CT=256
3,4,6,8 CT=0
1,2,3,4,
5,6,7,8
2
3
4
5
7
8
9
10
15
SF01086
1
20
SF01087
FUNCTION TABLE
INPUTS
MR
X
X
X
L
H
H
H
H
H
H
H
L
X
↑
(not LL)
=
=
=
=
=
SR
X
X
X
X
L
H
H
H
H
H
CS
H
L
L
X
X
L
(not LL)
(not LL)
(not LL)
(not LL)
PE
X
H
H
X
X
L
CEP
X
X
X
X
X
X
H
X
L
L
CET
X
X
X
X
X
X
X
H
L
L
U/D
X
X
X
X
X
X
X
X
H
L
OE
X
H
L
X
X
X
X
X
X
X
CP
X
X
X
X
↑
↑
↑
↑
↑
↑
I/O0 to I/O7 in high impedance (PE disabled)
I/O0 to I/O7 in high impedance
Flip-flop output appears on I/On lines
Asynchronous reset for all flip-flops
Synchronous reset for all flip-flops
Parallel load all flip-flops
Hold
Hold (TC held High)
Count up
Count down
OPERATING MODE
High voltage level
Low voltage level
Don’t care
Low-to-High clock transition
CS and PE should never be Low voltage level at the same time.
2000 Dec 18
3
Philips Semiconductors
Product specification
8-bit bidirectional binary counter (3-State)
74F579
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
CC
V
IN
I
IN
V
O
I
O
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature
TC
I/O0
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to +V
CC
40
48
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
O
OH
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High level output current
High-level
TC
I/O
n
Low-level
Low level output current
Operating free-air temperature range
TC
I/O
n
0
PARAMETER
MIN
4.5
2.0
0.8
–18
–1
–3
20
24
70
LIMITS
NOM
5.0
MAX
5.5
V
V
V
mA
mA
mA
mA
mA
°C
UNIT
I
O
OL
T
amb
2000 Dec 18
5
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