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IDT54FCT623AT

FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)

Integrated Device Technology 

IDT54/74FCT623T/AT/CT

FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

Symbol

Parameter

Test Conditions(1)

Min. Typ.(2) Max. Unit

∆ICC

ICCD

IC

Quiescent Power Supply Current

TTL Inputs HIGH

Dynamic Power Supply

Current(4)

Total Power Supply Current(6)

VCC = Max.

VIN = 3.4V(3)

VCC = Max.

Outputs Open

GBA = GAB = GND

One Input Toggling

50% Duty Cycle

VCC = Max.

Outputs Open

fi = 10MHz

VIN = VCC

VIN = GND

VIN = VCC

VIN = GND

— 0.5 2.0 mA

— 0.15 0.25 mA/

MHz

— 1.5 3.5 mA

50% Duty Cycle

GBA = GAB = GND

VIN = 3.4V

VIN = GND

— 1.8 4.5

One Bit Toggling

VCC = Max.

VIN = VCC

—

3.0 6.0(5)

Outputs Open

VIN = GND

fi = 2.5MHz

50% Duty Cycle

GBA = GAB = GND

VIN = 3.4V

VIN = GND

—

5.0 14.0(5)

Eight Bits Toggling

NOTES:

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

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.

2563 tbl 07

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

54/74FCT623T

Com'l.

Mil.

54/74FCT623AT

Com'l.

Mil.

54/74FCT623CT

Com'l.

Mil.

Symbol

Parameter

Condition(1)

Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit

tPLH

Propagation Delay

tPHL

An to Bn

CL = 50pF

RL = 500Ω

1.5 7.5 1.5 9.0 1.5 5.5 1.5 6.3 1.5 4.8 1.5 5.4 ns

tPLH

Propagation Delay

tPHL

Bn to An

1.5 7.5 1.5 9.5 1.5 5.5 1.5 6.3 1.5 4.8 1.5 5.4 ns

tPZH

Output Enable Time

tPZL

GBA to An

1.5 9.0 1.5 10.0 1.5 7.0 1.5 8.0 1.5 6.1 1.5 6.9 ns

tPHZ

Output Disable Time

tPLZ

GBA to An

1.5 8.0 1.5 9.0 1.5 6.5 1.5 7.4 1.5 5.6 1.5 6.4 ns

tPZH

Output Enable Time

tPZL

GAB to Bn

1.5 9.0 1.5 10.5 1.5 7.0 1.5 8.0 1.5 6.1 1.5 6.9 ns

tPHZ

Output Disable Time

tPLZ

GAB to Bn

1.5 8.0 1.5 9.0 1.5 6.5 1.5 7.4 1.5 5.6 1.5 6.4 ns

NOTES:

2563 tbl 07

1. See test circuit and waveforms.

2. Minimum limits are guaranteed but not tested on Propagation Delays

6.19

4

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