1
PS2084B 01/13/97
Product Description
Pericom Semiconductor's PI74FCT series of logic circuits are
produced in the Company's advanced 0.6 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25 ohm series resistor on
all outputs to reduce noise due to reflections, thus eliminating the
need for an external terminating resistor.
The PI74FCT191T is a high speed CMOS 4-bit binary up/down
counter. It has a single clock with clock enable and up/down
control inputs and ripple carry output. The 191 has asynchronous
preload inputs which override the count inputs. All inputs have
clamp diodes for undershoot noise suppression. All outputs have
ground bounce suppression.
Logic Block Diagram
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Product Features
· PI74FCT191/2191T is pin compatible with bipolar FASTTM
Series at a higher speed and lower power consumption
· 25
series resistor on all outputs (FCT2XXX only)
· TTL input and output levels
· Low ground bounce outputs (25
series only)
· Extremely low static power
· Hysteresis on all inputs
· Industrial operating temperature range: 40°C to +85°C
· Packages available:
16-pin 150 mil wide plastic QSOP (Q)
16-pin 300 mil wide plastic SOIC (S)
PI74FCT191T
(25
Series) PI74FCT2191T
High Speed CMOS Presettable Synchronous
4-Bit Binary Counters
CE
Q
3
-Q
0
PL
CP
U/D
TC
RC
25
(FCT2XXX ONLY)
25
(FCT2XXX ONLY)
D
0
-D
3
25
(FCT2XXX ONLY)
=F
=0
Cup
Q+Cup
- Cdn
Cdn
4-BIT
REGISTER
2
PS2084B 01/13/97
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PI74FCT191T
(25
SERIES) PI74FCT2191T
4-BIT BINARY COUNTERS
Product Pin Description
Truth Table
(1)
Product Pin Configurations
(All Pins Top View)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16-Pin
Q16
S16
Notes:
1. H = High Voltage Level
L= Low Voltage Level
X = Dont Care
Z= High Impedance
D1
Q1
Q0
CE
U/D
Q2
Q3
GND
VCC
D0
CP
RC
TC
PL
D2
D3
e
m
a
N
n
i
P
O
/
I
n
o
it
p
i
r
c
s
e
D
0
D
-
3
D
I
st
u
p
n
I
a
t
a
D
0
Q
-
3
Q
O
st
u
p
t
u
O
a
t
a
D
L
P
I
d
a
o
l
e
r
P
D
/
U
I
t
c
el
e
S
n
w
o
D
/
p
U
E
C
I
el
b
a
n
E
t
n
u
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C
P
C
I
k
c
o
l
C
t
n
u
o
C
C
T
O
t
n
u
o
C
l
a
n
i
m
r
e
T
C
R
O
k
c
o
l
C
el
p
p
i
R
s
t
u
p
n
I
s
t
u
p
t
u
O
L
P
D
/
U
P
C
E
C
I
D
0
Q
-
3
Q
C
T
C
R
n
o
it
c
n
u
F
L
X
X
X
0
D
-
3
D
0
D
-
3
D
X
X
a
t
a
D
d
a
o
L
H
L
L
X
1
+
Q
L
H
p
U
t
n
u
o
C
H
H
L
X
1
-
Q
L
H
n
w
o
D
t
n
u
o
C
H
X
X
H
X
Q
X
X
ti
b
i
h
n
I
t
n
u
o
C
H
L
L
X
F
H
H
1
1
1
1
=
p
U
t
n
u
o
C
H
L
L
X
F
H
1
1
1
1
=
p
U
t
n
u
o
C
H
L
X
X
X
E
-
0
L
H
p
U
t
n
u
o
C
1
1
1
1
H
H
H
L
X
0
H
H
0
0
0
0
=
n
w
o
D
t
n
u
o
C
H
H
L
X
0
H
0
0
0
0
=
n
w
o
D
t
n
u
o
C
H
H
X
X
X
F
-
1
L
H
n
w
o
D
t
n
u
o
C
0
0
0
0
3
PS2084B 01/13/97
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PI74FCT191T
(25
SERIES) PI74FCT2191T
4-BIT BINARY COUNTERS
Storage Temperature ................................................................. 65°C to +150°C
Ambient Temperature with Power Applied ................................. -40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) .......... 0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ....... 0.5V to +7.0V
DC Input Voltage ......................................................................... 0.5V to +7.0V
DC Output Current ................................................................................... 120 mA
Power Dissipation ......................................................................................... 0.5W
Note:
Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating
only and functional operation of the device at
these or any other conditions above those
indicated in the operational sections of this
specification is not implied. Exposure to
absolute maximum rating conditions for
extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40°C to +85°C, V
CC
= 5.0V ± 5%)
Parameters
Description
Test Conditions
(1)
Min. Typ
(2)
Max. Units
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 15.0 mA
2.4
3.0
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 48 mA
0.3
0.50
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 12 mA (25
Series)
0.3
0.50
V
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.8
V
I
IH
Input HIGH Current
V
CC
= Max.
V
IN
= V
CC
1
µA
I
IL
Input LOW Current
V
CC
= Max.
V
IN
= GND
1
µA
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
0.7
1.2
V
I
OFF
Power Down Disable
V
CC
= GND, V
OUT
= 4.5V
--
--
100
µA
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
OUT
= GND
60
120
mA
V
H
Input Hysteresis
200
mV
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
6
10
pF
C
OUT
Output Capacitance
V
OUT
= 0V
8
12
pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
4
PS2084B 01/13/97
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PI74FCT191T
(25
SERIES) PI74FCT2191T
4-BIT BINARY COUNTERS
Power Supply Characteristics
Parameters
Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
V
HC;
0.1
500
µA
Supply Current
Freq = 0
V
IN
V
LC
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
0.5
2.0
mA
Input @ TTL HIGH
Freq = 0
I
CCD
Supply Current per
V
CC
= Max.,
V
IN
= V
CC
0.15
0.25
mA/
Input per MHz
(4)
Outputs Open
V
IN
= GND
MHz
and Enabled
One Bit Toggling
50% Duty Cycle, other
input at GND or V
CC
Ic
Total Power Supply
Vcc=Max., Outputs Open
V
IN
= Vcc
--
0.8
2.3
mA
Current
(6)
Preset Mode
V
IN
= GND
PL=CE=U/D=CP=GND
One Bit Toggling
V
IN
= 3.4V
--
1.0
3.3
at fi = 5MHz
V
IN
= GND
50% Duty Cycle
Vcc=Max., Outputs Open
V
IN
= Vcc
--
3.0
6.0
(5)
Preset Mode
V
IN
= GND
PL=CE=U/D=CP=GND
Four Bits Toggling
V
IN
= 3.4V
--
4.0
10.0
(5)
at fi = 5MHz
V
IN
= GND
50% Duty Cycle
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
5
PS2084B 01/13/97
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PI74FCT191T
(25
SERIES) PI74FCT2191T
4-BIT BINARY COUNTERS
Switching Characteristics (Over Operating Range)
Notes:
1. See Test Circuit and Waveforms.
2. Minimum limits are guaranteed but not tested on Propgation Delays.
3. This parameter guaranteed but not production tested.
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6
PS2084B 01/13/97
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PI74FCT191T
(25
SERIES) PI74FCT2191T
4-BIT BINARY COUNTERS
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
Notes:
1.See Test Circuit and Waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter guaranteed but not production tested.
Timing Characteristics (Over Operating Range)
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