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PI74LPT244CS

Fast CMOS 3.3V 8-Bit Buffer/Line Driver

Pericom Semiconductor 

PI74LPT244

3.3V 8-Bit Buffer /Line Driver

Capacitance (TA = 25°C, f = 1 MHz)

Parameters(1)

Description

Test Conditions

CIN

Input Capacitance

VIN = 0V

COUT

Output Capacitance

VOUT = 0V

Notes:

1. This parameter is determined by device characterization but is not production tested.

Typ

4.5

5.5

Max.

6

8

Units

pF

Power Supply Characteristics

Parameters Description

Test Conditions(1)

Min. Typ(2)

ICC

Quiescent Power Supply VCC = Max.

Current

VIN = GND

0.1

or VCC

ΔICC

Quiescent Power Supply VCC = Max.

Current

VIN = VCC

– 0.6V(3)

TTL Inputs HIGH

ICCD

Dynamic Power Supply(4) VCC = Max.,

VIN = VCC

50

Outputs Open OEX = GND

VIN = GND

One Bit Toggling

50% Duty Cycle

IC

Total Power Supply

VCC = Max., Outputs

VIN = VCC

0.6

Current(6)

Open fI = 10 MHZ

– 0.6V

50% Duty Cycle

VIN = GND

OEX = GND

One Bit Toggling

VCC = Max., Outputs

VIN = VCC

2.1

Open fI = 2.5 MHZ

– 0.6V

50% Duty Cycle

VIN = GND

OEX = GND

8 Bits Toggling

Notes:

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

2. Typical values are at Vcc = 3.3V, +25°C ambient.

3. Per TTL driven input; 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 + ΔICC DHNT + ICCD (fCP/2 + fINI)

ICC = Quiescent Current (ICCL, ICCH and ICCZ)

ΔICC = Power Supply Current for a TTL High Input

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)

NCP = Number of Clock Inputs at fCP

fI = Input Frequency

NI = Number of Inputs at fI

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

Max. Units

10 µA

500 µA

75 µA/

MHz

2.3 mA

4.7(5) mA

06-0181

4

PS2058F 06/05/06

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