9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 31 January 2005 5 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
7. Functional description
7.1 Function table
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
8. Limiting values
[1] For DIP20 packages: above 70 °C, P
tot
derates linearly with 12 mW/K.
For SO20 packages: above 70 °C, P
tot
derates linearly with 8 mW/K.
For SSOP20 and TSSOP20 packages: above 60 °C, P
tot
derates linearly with 5.5 mW/K.
For DHVQFN20 packages: above 60 °C, P
tot
derates linearly with 4.5 mW/K.
B1 17 data input/output
B0 18 data input/output
OE 19 output enable input (active LOW)
V
CC
20 supply voltage
Table 3: Pin description
…continued
Symbol Pin Description
Table 4: Function table
[1]
Input Input/output
OE DIR An Bn
L L A = B input
L H input B = A
HXZZ
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
V
CC
supply voltage −0.5 +7 V
I
IK
input diode current V
I
< −0.5 V or V
I
>V
CC
+ 0.5 V - ±20 mA
I
OK
output diode current V
O
< −0.5 V or
V
O
>V
CC
+ 0.5 V
- ±20 mA
I
O
output source or sink
current
V
O
= −0.5 V to V
CC
+ 0.5 V - ±35 mA
I
CC
, I
GND
V
CC
or GND current - ±70 mA
T
stg
storage temperature −65 +150 °C
P
tot
total power dissipation
[1]
DIP20 package - 750 mW
SO20, SSOP20,
TSSOP20 and
DHVQFN20 packages
- 500 mW
