74LS244

Octal buffer/line driver; 3-state

Courtesy/Thanks to: Philips Semiconductor

Description: FEATURES
· ESD protection:
HBM EIA/JESD22-A114-A
exceeds 2000 V
MM EIA/JESD22-A115-A
exceeds 200 V
CDM EIA/JESD22-C101
exceeds 1000 V
· Balanced propagation delays
· All inputs have a Schmitt-trigger
action
· Inputs accepts voltages higher than
VCC
· For AHC only:
operates with CMOS input levels
· For AHCT only:
operates with TTL input levels
· Specified from
-40 to +85 and +125 °C.
DESCRIPTION
The 74AHC/AHCT244 is a
high-speed Si-gate CMOS device.
The 74AHC/AHCT244 is an octal
non-inverting buffer/line driver with
3-state outputs.
The 3-state outputs are controlled by
the outputs enable inputs 1OE and
2OE.
A HIGH on nOE causes the outputs to
assume a high-impedance OFF state.
FUNCTION TABLE
See note 1.
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF state.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25°C; tr =tf£3.0 ns.
Notes
1. CPD is used to determine the dynamic power dissipation (PD in mW).
INPUTS OUTPUT
nOE nAn nYn
L L L
L HH
H XZ
SYMBOL PARAMETER CONDITIONS
TYPICAL
UNIT
AHC AHCT
tPHL/tPLH propagation delay
1An to 1Yn;
2An to 2Yn
CL =15 pF;
VCC =5 V
3.5 5.0 ns
CI input capacitance VI =VCC or GND 3.5 3.5 pF
CO output capacitance 4.0 4.0 pF
CPD power dissipation
capacitance
CL =50 pF;
f = 1 MHz;
notes 1 and 2
10 12 pF