SN54HCT245, SN74HCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS020C – MARCH 1984 – REVISED MAY 1997
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range†
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO (VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): DB package 115°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 128°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
SN54HCT245 SN74HCT245
MIN NOM MAX MIN NOM MAX
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage VCC = 4.5 V to 5.5 V 2 2 V
VIL Low-level input voltage VCC = 4.5 V to 5.5 V 0 0.8 0 0.8 V
VIInput voltage 0 VCC 0 VCC V
VOOutput voltage 0 VCC 0 VCC V
ttInput transition (rise and fall) time 0 500 0 500 ns
TAOperating free-air temperature –55 125 –40 85 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
TA = 25°C SN54HCT245 SN74HCT245
CC MIN TYP MAX MIN MAX MIN MAX
IOH = –20 µA
4.4 4.499 4.4 4.4
OH
I =
IH
IL IOH = –6 mA
.
3.98 4.3 3.7 3.84
IOL = 20 µA
0.001 0.1 0.1 0.1
OL
I =
IH
IL IOL = 6 mA
.
0.17 0.26 0.4 0.33
IIDIR or OE VI = VCC or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
IOZ A or B VO = VCC or 0 5.5 V ±0.01 ±0.5 ±10 ±5µA
ICC VI = VCC or 0, IO = 0 5.5 V 8 160 80 µA
∆ICC‡One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC 5.5 V 1.4 2.4 3 2.9 mA
Ci§DIR or OE 4.5 V
to 5.5 V 3 10 10 10 pF
‡This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
§Parameter Ci does not apply to transceiver I/O ports.