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74HC244D-74HC244DB-74HC244N-74HC244PW-74HCT244BQ-74HCT244D-74HCT244DB
74HC/HCT244; Octal buffer/line driver; 3-state

Philips Semiconductors Product specification
Octal buffer/line driver; 3-state 74HC/HCT244
FEATURES
Output capability: bus driver ICC category: MSI
GENERAL DESCRIPTION

The 74HC/HCT244 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT244 are octal non-inverting buffer/line
drivers with 3-state outputs. The 3-state outputs are
controlled by the output enable inputs 1OE and 2OE.
A HIGH on nOE causes the outputs to assume a high
impedance OFF-state. The “244” is identical to the “240”
but has non-inverting outputs.
QUICK REFERENCE DATA

GND=0 V; Tamb =25 °C; tr =tf= 6 ns
Notes
CPD is used to determine the dynamic power dissipation (PD in μW): =CPD× VCC2×fi +∑ (CL× VCC2× fo) where:= input frequency in MHz= output frequency in MHz (CL× VCC2×fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC− 1.5V
ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state 74HC/HCT244
PIN DESCRIPTION
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state 74HC/HCT244
FUNCTION TABLE
Note
H= HIGH voltage level= LOW voltage level= don’t care= high impedance OFF-state
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state 74HC/HCT244
DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC

GND=0 V; tr =tf=6 ns; CL =50pF
Philips Semiconductors Product specification
Octal buffer/line driver; 3-state 74HC/HCT244
DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT types

The value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT

GND=0 V; tr =tf=6 ns; CL =50pF
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