CashFlow
9520 / 9524 / 9528 Design Guide
MEI., 2003
Page
28
Rev: G1
Output Common Specification
Sample multiplexed implementation - Negative Common Strobe
Cashflow
126
Outputs
A
B
C
D
E
F
OutputCom
Strobe 1
Strobe 2
A
B
C
D
E
F
A
B
C
D
E
F
Multiplexed
Bus
Vcc
Option
Switches
etc.
R ohms
I= 6xVcc/R
Rx10
(470)
(4k7)
(150mA)
Output common can be left floating for multiplexed implementations. However the minimum
turn on time when output common was floating is 15 micro seconds. If the polarity is
established on output common by means of a weak pull up (for -ve com) or pull down (-ve
com) the turn on time can be reduced. In the case above, the maximum time from the
output common being strobed to the output being true is approximately 1 micro second.
See the diagrams below for sample multiplexing implementation.
If output common is changed form negative to positive common (or vice versa) during
polling, the state of any coin output cannot be guaranteed for 15us.
Summary of Contents for CASHFLOW 9520
Page 1: ...MEI 2003 Rev G1 CASHFLOW 9520 9524 9528 SELECTOR SYSTEMS DESIGN GUIDE...
Page 33: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 33 Rev G1...
Page 34: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 34 Rev G1...
Page 35: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 35 Rev G1...
Page 36: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 36 Rev G1...
Page 37: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 37 Rev G1...
Page 38: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 38 Rev G1...
Page 39: ...CashFlow 9520 9524 9528 Design Guide MEI 2003 Page 39 Rev G1...
Page 48: ...CashFlow 9520 9524 9528 Design Guide HELPING YOU DELIVER YOUR REPRESENTATIVE...
