Texas Instruments CY74FCT191CTSOCT, CY74FCT191CTSOC, CY74FCT191CTQCT, CY74FCT191CTQC, CY74FCT191ATSOCT Datasheet

4-Bit Up/Down Binary Counter

CY74FCT191T

SCCS016 - May 1994 - Revised February 2000

Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.

Copyright © 2000, Texas Instruments Incorporated

Features

• Function, pinout, and drive compatible with FCT and F
logic

• FCT-C speed at 6.2 ns max,
FCT-A speed at 7.8 ns max.

• Reduced V

OH

(typically = 3.3V) versions of equivalent

FCT functions

• Edge-rate control circuitry for significantly improved
noise characteristics

• Power-off disable permits live insertion

• ESD > 2000V

• Matched rise and fall times

• Sink current 64 mA
Source current 32 mA

Functional Description

The FCT191T is a reversible modulo-16 binary counter,
featuringsynchronouscountingandasynchronouspresetting.
The preset allows the FCT191T to be used in programmable
dividers. The count enable input, terminal count output, and ripple
clock output make possible a variety of methods of implementing
multiusage counters. In the counting modes, state changes are
initiated by the rising edge of the clock.

The outputs are designed with a power-off disable feature to
allow for live insertion of boards.

Logic Block Diagram

CP

RC Q

0

J

Q

CLOCK

PRESET

K

CLEAR

Q

J

Q

CLOCK

PRESET

K

CLEAR

Q

J

Q

CLOCK

PRESET

K

CLEAR

Q

J

Q

CLOCK

PRESET

K

CLEAR

Q

Q

1

Q

2

Q

3

TC

CEP

0

P

1

P

2

P

3

PLU/D

Pin Configurations

1
2
3
4
5
6
7
8

Q

1

Q

0

CE

U/D

Q

2

Q

3

V

CC

GND

Top View

SOIC/QSOP

16
15
14
13
12
11

10

9

P

1

PL
P

2

P

3

P

0

CP
RC
TC

Pin Description

Name Description

CE Count Enable Input (Active LOW)
CP Clock Pulse Input (Active Rising Edge)
P Parallel Data Inputs
PL Asynchronous Parallel Load Input (Active LOW)
U/D Up/Down Count Control Input
Q Flip-Flop Outputs
RC Ripple Clock Output (Active LOW)
TC Terminal Count Output

RC Function Table

[1]

Inputs Outputs

CE CP T

[2]

RC

L
H
X

X
X

H
X

L

H
H

CY74FCT191T

2

Maximum Ratings

[3, 4]

(Above which the useful life may be impaired. For user guide­lines, not tested.)

Storage Temperature .................................–65°C to +150°C

Ambient Temperature with

Power Applied.............................................–65°C to +135°C

Supply Voltage to Ground Potential............... –0.5V to +7.0V

DC Input Voltage ........................................... –0.5V to +7.0V

DC Output Voltage......................................... –0.5V to +7.0V

DC Output Current (Maximum Sink Current/Pin) ......120 mA

Power Dissipation..........................................................0.5W

Static Discharge Voltage............................................>2001V

(per MIL-STD-883, Method 3015)

Notes:

1. H = HIGH Voltage Level, L = LOW Voltage Level, X = Don‘t Care,
= LOW-to-HIGH clock transition. =Low Pulse.

2. TC is generated internally.

Mode Select

[1]

Inputs

PL CE U/D CP Mode

H
H

L

H

L
L
X

H

L
H
X
X

X
X

Count Up
Count Down
Preset (Asynchronous)
No Change (Hold)

RC Function Table

[1]

Inputs Outputs

CE CP T

[2]

RC

Operating Range

Range

Ambient

Temperature V

CC

Commercial –40°C to +85°C 5V ± 5%

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions Min. Typ.

[5]

Max. Unit

V

OH

Output HIGH Voltage VCC=Min., IOH=–32 mA 2.0 V

VCC=Min., IOH=–15 mA 2.4 3.3 V

V

OL

Output LOW Voltage VCC=Min., IOL=64 mA 0.3 0.55 V

V

IH

Input HIGH Voltage 2.0 V

V

IL

Input LOW Voltage 0.8 V

V

H

Hysteresis

[6]

All inputs 0.2 V

V

IK

Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 –1.2 V

I

I

Input HIGH Current VCC=Max., VIN=V

CC

5 µA

I

IH

Input HIGH Current VCC=Max., VIN=2.7V ±1 µA

I

IL

Input LOW Current VCC=Max., VIN=0.5V ±1 µA

I

OS

Output Short Circuit Current

[7]

VCC=Max., V

OUT

=0.0V –60 –120 –225 mA

I

OFF

Power-Off Disable VCC=0V, V

OUT

=4.5V ±1 µA

Capacitance

[6]

Parameter Description Typ.

[5]

Max. Unit

C

IN

Input Capacitance 5 10 pF

C

OUT

Output Capacitance 9 12 pF

Notes:

3. Unless otherwise noted, these limits are over the operating free-air temperature range.

4. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V

CC

or ground.

5. Typical values are at VCC=5.0V, TA=+25˚C ambient.

6. This parameter is specified but not tested.

7. Not more than one output should beshorted ata time. Duration ofshort should not exceed one second. The use of high-speedtest apparatus and/or sample
and hold techniques are preferable in order to minimize internal chipheating and more accurately reflect operational values. Otherwiseprolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, IOS tests should be performed last.

CY74FCT191T

3

Power Supply Characteristics

Parameter Description Test Conditions Typ.

[5]

Max. Unit

I

CC

Quiescent Power Supply Current VCC=Max., VIN< 0.2V,

V

IN

> VCC–0.2V

0.1 0.2 mA

∆I

CC

Quiescent Power Supply Current
(TTL inputs HIGH)

VCC=Max., VIN=3.4V,

[8]

f1=0, Outputs Open

0.5 2.0 mA

I

CCD

Dynamic Power Supply Current

[9]

VCC=Max.,OneBit Toggling,Preset Mode,
50% Duty Cycle, Outputs Open,
MR=VCC=SR,
PL=CE=U/D=CP=GND,
V

IN

< 0.2V or VIN> VCC–0.2V

0.06 0.12 mA/MHz

I

C

Total Power Supply Current

[10]

VCC=Max., Preset Mode,
50% Duty Cycle, Outputs Open,
One Bit Toggling at f

1

=5 MHz,
PL=CE=U/D=CP=GND,
V

IN=VCC,VIN

=GND

0.4 0.8 mA

VCC=Max., Preset Mode,
50% Duty Cycle, Outputs Open,
One Bit Toggling at f

1

=5 MHz,
V

IN

=3.4V or VIN=GND

0.7 1.8 mA

VCC=Max., Preset Mode,
50% Duty Cycle, Outputs Open,
Four Bits Toggling at f

1

=5 MHz,
PL=CE=U/D=CP=GND,
V

IN=VCC,VIN

=GND

1.3 2.6

[11]

mA

VCC=Max., Preset Mode,
50% Duty Cycle, Outputs Open,
Four Bits Toggling at f

1

=5 MHz,
PL=CE=U/D=CP=GND,
V

IN

=3.4V or VIN=GND

2.3 6.6

[11]

mA

Notes:

8. Per TTL driven input (V

IN

=3.4V); all other inputs at VCC or GND.

9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.

10. I

C=IQUIESCENT

+ I

INPUTS

+ I

DYNAMIC

IC=ICC+∆ICCDHNT+I

CCD(f0

/2 + f1N1)

I

CC

= Quiescent Current with CMOS input levels

∆I

CC

= Power Supply Current for a TTL HIGH input (VIN=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

0

= Clock frequency for registered devices, otherwise zero

f

1

= Input signal frequency

N

1

= Number of inputs changing at f

1

All currents are in milliamps and all frequencies are in megahertz.

11. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.

CY74FCT191T

4

Document #: 38-00286-B

Switching Characteristics Over the Operating Range

Parameter Description

CY74FCT191AT CY74FCT191CT

Unit Fig. No.

[13]

Min.

[12]

Max. Min.

[12]

Max.

t

PLH

t

PHL

Propagation Delay
CP to Q

n

1.5 7.8 1.5 6.2 ns 1, 5

t

PLH

t

PHL

Propagation Delay
CP to TC

1.5 11.8 1.5 9.4 ns 1, 5

t

PLH

t

PHL

Propagation Delay
CP to

RC

1.5 8.5 1.5 6.8 ns 1, 5

t

PLH

t

PHL

Propagation Delay
CE to RC

1.5 7.2 1.5 6.0 ns 1, 5

t

PLH

t

PHL

Propagation Delay
U/D to RC

1.5 13.0 1.5 11.0 ns 1, 5

t

PLH

t

PHL

Propagation Delay
U/D to TC

1.5 7.2 1.5 6.1 ns 1, 5

t

PLH

t

PHL

Propagation Delay
P

n

to Q

n

1.5 9.1 1.5 7.7 ns 1, 5

t

PLH

t

PHL

Propagation Delay
PL to Q

n

2.0 8.5 2.0 7.2 ns 1, 5

t

SU

Set-Up Time
HIGH or LOW P

n

to PL

4.0 3.5 ns 4

t

H

Hold Time
HIGH or LOW P

n

to PL

1.5 1.0 ns 4

t

SU

Set-Up Time LOW
CE to CP

9.0 7.2 ns 4

t

H

Hold Time
LOW

CE to CP

0 0 ns 4

t

SU

Set-Up Time
HIGH or LOW

U/D to CP

10.0 8.0 ns 4

t

H

Hold Time
HIGH or LOW

U/D to CP

0 0 ns 4

t

W

PL Pulse Width LOW 5.5 5.0 ns 5

t

W

Clock Pulse Width

[6]

HIGH or LOW

4.0 4.0 ns 5

t

REM

Recovery Time
PL to CP

5.0 4.5 ns 6

Notes:

12. Minimum limits are specified but not tested on Propagation Delays.

13. See “Parameter Measurement Information” in the General Information section.

Ordering Information

Speed

(ns) Ordering Code

Package

Name Package Type

Operating

Range

6.2 CY74FCT191CTQCT Q1 16-Lead (150-Mil) QSOP Commercial
CY74FCT191CTSOC/SOCT S1 16-Lead (300-Mil) Molded SOIC

7.8 CY74FCT191ATSOC/SOCT S1 16-Lead (300-Mil) Molded SOIC Commercial

CY74FCT191T

5

Package Diagrams

16-Lead Quarter Size Outline Q1

16-Lead Molded SOIC S1

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Copyright  2000, Texas Instruments Incorporated