Epson SQ-B50/2550 Technical Manual page 276

REV.-A
Table A-7. E05A23GC Terminal Functions
Pin No.
Terminal I/O
Description
1
R1
I Internal VCO unit oscilation setting resister
2 VCOIN I VCO input (from phase comperator)
3
R2
I Internal VCO unit oscilation setting resister
4 CB I VCO Charge/discharge control
5
CA
0
6 VCOOUT
0
VCO output
• 4046 compatible
7
AVcc - Analog power sourse
8
AGND
-
Analog GND
9 TRIG I Internal timer trigger signal
10 CTRL I Timer control signal
1 1
N.C. -
12
THR I Timer threshold signal
13 DISC
0
Timer discharge output
14
lOUT 0 Timer output
• 555 compatible
15 POUT 0 Internal voltage comperater output
16
MINUS
I
Comperater input
17
PLUS
I
Comperater input
18 AVcc - Analog power sourse
19
GND
-
GND
20 ENC A I Encoder signal input (CMOS schmitt trigger)
21 ENC B
22
HOME
I Home position siganal input
23 XOUT 0 External x'tal terminal
24 XIN I
25 - 27 AO-A2 I Address decoder input
-
CE I Chip enable signal 28
29 OE I Output enable signal
30 WE I Write enable signal
31 Vcc(+5V) - Power sourse
32
PNP1
0
PNP transistor drive signal (open drain)
33 PNP2
0
PNP transistor drive signal (open drain)
34 N.C.
-
35 GND -
36 NPN1 0 NPN transistor drive signal (push-pull)
37 NPN2 0 NPN transistor drive signal (push-pull)
38 N.C.
-
39 N.C.
-
40- 43 DO-D3 I/O
Data bus
44 GND
-
GND
45 -48
D4-D7 I/O Data bus
49
GND - GND
50 TSTQ
I Clock input for timer output simulation (N.U.)
A-18