Measurement Computing PCI-CTR20HD - Manual (Page 16)

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
9513
Configuration Four 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 (CTRxGATEn) individually pulled up through 10 K 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 #1-5 input
Gate #1-5 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: (each counter individually)
External (max = 7.0 MHz) EXT SRCA_IN, EXT SRCB_IN, EXT SRCC_IN, EXT SRCD_IN
1.0
MHz (10MHz Xtal divided by 10)
5.0 MHz (10MHz Xtal divided by 2)
3.33 MHz (33 MHz PCI clock divided by 10)
1.67 MHz (33 MHz PCI clock divided by 20)
4-1