SY10E136 Micrel Semiconductor, SY10E136 Datasheet

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SY10E136

Manufacturer Part Number
SY10E136
Description
6-BIT UNIVERSAL UP/DOWN COUNTER
Manufacturer
Micrel Semiconductor
Datasheet

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D
Q
S
MR
CLK
C
CL
C
CL
V
FEATURES
PIN CONFIGURATION
PIN NAMES
550MHz count frequency
Extended 100E V
Look-ahead-carry input and output
Fully synchronous up and down counting
Asynchronous Master Reset
Internal 75K input pull-down resistors
Available in 28-pin PLCC package
1
CCO
0
OUT
IN
0
–D
, S
–Q
OUT
IN
2
, C
5
Pin
5
CLK
CL
V
C
OUT
D
S
S
EE
IN
IN
2
2
1
2
3
4
26
27
28
1
25 24 23 22 21
5
EE
6
Preset Data Inputs
Differential Data Outputs
Mode Control Pins
Master Reset
Clock Input
Carry Out Output (Active LOW)
Look-Ahead-Carry Output
Carry-In Input (Active LOW)
Look-Ahead-Carry Input
V
range of –4.2V to –5.5V
CC
TOP VIEW
7
PLCC
to Output
J28-1
8
9
Function
20 19
10 11
18
17
16
15
14
13
12
Q
Q
V
V
C
CL
C
CC
CCO
OUT
3
2
OUT
6-BIT UNIVERSAL
UP/DOWN COUNTER
OUT
1
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.
one count before the E136 reaches terminal count. The
C
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 C
programmable divider and self-stopping counter
applications.
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 carry-
out 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 (see block diagram) the
operation of the carry-out outputs and the look-ahead-
carry-in input when utilizing the Master Reset.
LOW via an input pulldown resistor. The Master Reset is
an asynchronous signal which, when asserted, will force
the Q outputs LOW.
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.
OUT
DESCRIPTION
The SY10/100E136 are 6-bit synchronous, presettable,
The CL
Unlike the H136 and other similar universal counter
When left open, all of the input pins will be pulled
The Q outputs need not be terminated for the E136 to
output will pulse LOW for one clock cycle when
OUT
output will pulse LOW for one clock cycle
OUT
output facilitates the E136's use in
Rev.: C
Issue Date: February, 1998
SY100E136
SY10E136
Amendment: /1

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SY10E136 Summary of contents

Page 1

... 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. 1 SY10E136 SY100E136 output will pulse LOW for one clock cycle output facilitates the E136's use in OUT Rev ...

Page 2

... BLOCK DIAGRAM NOTE: 1. This diagram is provided for understanding of logic operation only. It should not be used for propagation delays as many gate functions are achieved internally without incurring a full gate delay. BITS 2 – 4 E136 Universal Up/Down Counter Logic Diagram 2 SY10E136 SY100E136 – Q ...

Page 3

... SY10E136 SY100E136 C CL OUT OUT ...

Page 4

... SY10E136 SY100E136 Condition — — Condition — — — — — — — ...

Page 5

... OUT OUT D – 111110 111111 Figure 1. 24-bit Cascaded E136 Counter 5 Q – – CLK CLK MSB OUT OUT IN D – – 000000 000001 SY10E136 SY100E136 5 C OUT OUT 5 ...

Page 6

... Table 1. Preset Inputs Versus Divide Ratio SY10E136 SY100E136 rather than input ...

Page 7

... OUT OUT D0 – D5 Figure 5. 24-bit Programmable Divider Architecture 7 000010 000001 000000 Q – – CLK CLK 1 MSB OUT OUT IN D0 – – D5 SY10E136 SY100E136 LOAD S 1 OUT OUT ...

Page 8

... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc (408) 914-7878 http://www.micrel.com FAX WEB © 2000 Micrel Incorporated 8 SY10E136 SY100E136 Rev. 03 ...

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