ST70137

20/22

Rise and Fall Time Measures

Input / Output TTL Generic Characteristics

The value presented in the following table apply for all TTL inputs and/or outputs unless otherwise

specified.

* Guaranted by design.

Note:

The reference current is dependent on the exact buffer chosen and is a part of the buffer name.

The available values are 2, 4 and 8mA.

Symbol

Parameter

Test Condition

Minimum

Typical

Maximum

Units

Low Level Input Voltage

0.8

V

High Level Input Voltage

2.0

V

Low Level Threshold, falling *

Slow edge < 1V/

µs

0.9

1.35

V

Low Level Threshold, rising *

Slow edge < 1V/

µs

1.3

1.9

V

Schmitt Trigger Hysteresis *

Slow edge < 1V

µs

0.4

0.7

V

Low Level Output Voltage

0.4

V

High Level Output Voltage

2.4

V

90%

10%

10%

90%