Tektronix CURVE-TRACER 576 Instruction Manual page 246

SECTION 8-TYPE 576
r--------,
~
14
SN7400N
Quadruple 2-1 nput NAND Gate
Each gate may be used as a:
2
13
NAND Gate
Inverter
3
12
~
Truth Table
A
B
X
4
11
Inverted Input
OR Gate
H H L
H L H
5
10
~
L H H
L L H
6
9
IGNDI
7
8
SN7493 N
4-B it Binary Counter
14
2 13
Device becomes a + 16 counter
when pin 12 is externally con-
3 12 + 2
nected to pin 1. Pin 14 is sensitive
to only negative going transitions.
4
11 + 8
A high at pin 2 and pin 3 resets all
the outputs to lows.
I
Vee
I
5 10 IGND I
6
9+2
7
8+4
Timing Chart for+ 16 Operation
_j
Fig. 8-1. Integrated circuits used in step generator circuit: SN7400N and SN7493N.
Input to pin 14
Output from
pin 12
Output from
pin 9
Output from
pin 8
Output from
pin 11
I