SN54AHCT244, SN74AHCT244 OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS

description/ordering information

These octal buffers/drivers are designed specifically to improve both the performance and density of 3-state memory-address drivers, clock drivers, and bus-oriented receivers and transmitters. The ’AHCT244 devices are organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC . . . . . . . . . . .. . . . . –0.5 V to 7 V

Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . –0.5 V to 7 V

Output voltage range, VO (see Note 1) . . . . . . . . . . –0.5 V to VCC + 0.5 V

Input clamp current, IIK (VI < 0) . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . –20 mA

Output clamp current, IOK (VO < 0 or VO > VCC) . . . .. . . . . . . . . . . . . . . . . . ±20 mA

Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . ±25 mA

Continuous current through VCC or GND . . . . . . . . . . . . . ±75 mA

Package thermal impedance, θJA (see Note 2): DB package 70 . . . . . . . . °C/W

DGV package 92 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C/W

DW package 58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C/W

N package 69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C/W

NS package 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C/W

PW package 83 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C/W

Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C

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