Measurement Computing PCI-CTR10 - Manual (Page 14)

Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Counters
Refer to CTS9513-2 data sheet for complete 9513 specifications and operating modes. The SAVE command for
the CTS9513 device does not behave predictably when using clocks which are not synchronous with the logic
timing. If the SAVE command must be used, we strongly recommend that the 3.3 MHz clock derived from the
33 MHz PCI clock be selected as the clock source. The CTS9513-2 data sheet is available on our web site at
www.mccdaq.com/PDFmanuals/9513A.pdf .
Table 1. Counter specifications
Parameter Conditions
Counter type
CTS9513
Configuration Two 9513 devices. Five up/down counters per 9513, 16-bits each.
Compatibility 5V/TTL
Each 9513 device is programmable for:
Clock source
Software selectable:
External:
!
Counter 1-5 clock inputs
! Counter 1-5 gate inputs
Internal:
!
Terminal count of previous counter
! X2 clock frequency scaler
Gate Software selectable source:
External:
!
Active high or low level or edge, counter 1 – 5 gate input
! Active high level previous gate or next gate
! All external gate signals (CTRnGATE) individually pulled up through 10K resistors to
+5V.
Internal:
!
Active high previous counter terminal count
! No gating.
Output Software selectable:
!
Always low
! High pulse on terminal count
! Low pulse on terminal count
! Toggle on terminal count
! Inactive, high impedance at user connector counter # output.
Osc Out Software selectable source:
!
Counter # input
! Gate # input
! Prescaled clock source (X2 clock frequency scaler)
Software selectable divider:
!
Division by 1-16
Software selectable enable:
!
On or low impedance to ground.
Clock input frequency 6.8 MHz max (145 nS min period)
X2 clock input sources Software selectable:
!
1.0 MHz (10 MHz Xtal divided by 10)
! 5.0 MHz (10 MHz Xtal divided by 2)
! 3.3 MHz (33 MHz PCI clock divided by 10)
4-1