PI74FCT191T View Datasheet(PDF) - Pericom Semiconductor

Part Name

Description

MFG CO.

PI74FCT191T

High Speed CMOS Presettable Synchronous 4-Bit Binary Counters

Pericom Semiconductor 

PI74FCT191T

(25Ω SERIES) PI74FCT2191T

4-BIT BINARY COUNTERS 1122334455667788990011223344556677889900112233445566778899001122112233445566778899001122334455667788990011223344556677889900112211223344556677889900112233445566778899001122334455667788990011221122334455667788990011223344556677889900112233445566778899001122112233445566778899001122

Power Supply Characteristics

Parameters Description

ICC

Quiescent Power

Supply Current

∆ICC

Supply Current per

Input @ TTL HIGH

ICCD

Supply Current per

Input per MHz(4)

Test Conditions(1) Min.

VCC = Max.

Freq = 0

VCC = Max.

Freq = 0

VIN ≥ VHC;

VIN ≥ VLC

VIN = 3.4V(3)

VCC = Max.,

Outputs Open

and Enabled

One Bit Toggling

50% Duty Cycle, other

input at GND or VCC

VIN = VCC

VIN = GND

Typ(2) Max. Units

0.1 500 µA

0.5 2.0 mA

0.15 0.25 mA/

MHz

Ic

Total Power Supply

Current(6)

Vcc=Max., Outputs Open

Preset Mode

PL=CE=U/D=CP=GND

One Bit Toggling

at fi = 5MHz

50% Duty Cycle

VIN = Vcc

VIN = GND

VIN = 3.4V

VIN = GND

— 0.8 2.3 mA

— 1.0 3.3

Vcc=Max., Outputs Open

Preset Mode

PL=CE=U/D=CP=GND

Four Bits Toggling

at fi = 5MHz

50% Duty Cycle

VIN = Vcc

VIN = GND

VIN = 3.4V

VIN = GND

—

3.0 6.0(5)

—

4.0 10.0(5)

Notes:

1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Per TTL driven input (VIN = 3.4V); all other inputs at VCC 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. IC =IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fINI)

ICC = Quiescent Current

∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)

DH = Duty Cycle for TTL Inputs High

NT = Number of TTL Inputs at DH

ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)

fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)

fI = Input Frequency

NI = Number of Inputs at fI

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

4

PS2084B 01/13/97

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