Microchip logo
  • All
  • Products
  • Documents
  • Applications Notes
product primary image

SY100E136

Status: Not Recommended for new designs

Features:

  • 550MHz count frequency
  • Extended 100E VEE range of –4.2V to –5.5V
  • Look-ahead-carry input and output
  • Fully synchronous up and down counting
  • Asynchronous Master Reset
  • Internal 75KΩ input pull-down resistors
  • Available in 28-pin PLCC package
View More
Overview
Documents
Development Environment
RoHS Information
Add To Cart

Device Overview

Summary

The SY10/100E136 are 6-bit synchronous, presettable, cascadable universal counters. These devices generate a look-ahead-carry output and accept a look-ahead-carry input. These two features allow for the cascading of multiple E136s for wider bit width counters that operate at very nearly the same frequency as the stand-alone counter.

The CLOUT output will pulse LOW for one clock cycle one count before the E136 reaches terminal count. The COUT output will pulse LOW for one clock cycle when the counter reaches terminal count. For more information on utilizing the look-ahead-carry features of the device, please refer to the applications section of this data sheet. The differential COUT output facilitates the E136's use in programmable divider and self-stopping counter applications.Unlike the H136 and other similar universal counter designs, the E136 carry-out and look-ahead-carry-out signals are registered on chip.

 This design alleviates the glitch problem seen on many counters where the carryout signals are merely gated. Because of this architecture, there are some minor functional differences between the E136 and H136 counters. The user, regardless of familiarity with the H136, should read this data sheet carefully. Note specifically the operation of the carry-out outputs and the look-aheadcarry- in input when utilizing the Master Reset. When left open, all of the input pins will be pulled LOW via an input pulldown resistor. The Master Reset is an asynchronous signal which, when asserted, will force the Q outputs LOW.

The Q outputs need not be terminated for the E136 to function properly. In fact, if these outputs will not be used in a system, it is recommended that they be left open to save power and minimize noise. This practice will minimize switching noise which can reduce the maximum count frequency of the device, or significantly reduce margins against other noise in the system.

Additional Features
    • 550MHz count frequency
    • Extended 100E VEE range of –4.2V to –5.5V
    • Look-ahead-carry input and output
    • Fully synchronous up and down counting
    • Asynchronous Master Reset
    • Internal 75KΩ input pull-down resistors
    • Available in 28-pin PLCC package
Parametrics
Name
Value
Description
4x4
Supply Voltage
5V
Max Data (Gbps)
6.4
Icc (mA)
155
Max Within Device Skew (ps)
25
OE
False
RPE
False
FSI
False
Input Mux
True
Input EQ
False
Output Type
CML
Output Voltage
1.2/1.8/2.5V

Documents

Jump to:

Development tools data is currently unavailable.


Rohs data is currently unavailable.

Buy from Microchip

Grid
View
Table
View
Filter:
Apply
Clear
Only show products with samples
Product
Leads
Package Type
Temp Range
Packing Media
5K Pricing
Buy