SY10/100E136 Micrel Semiconductor, SY10/100E136 Datasheet

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SY10/100E136

Manufacturer Part Number
SY10/100E136
Description
Manufacturer
Micrel Semiconductor
Datasheet
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
FINAL

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SY10/100E136 Summary of contents

Page 1

... CCO CC 6-BIT UNIVERSAL UP/DOWN COUNTER DESCRIPTION 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 ...

Page 2

Micrel (1) LOGIC DIAGRAM 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 ...

Page 3

Micrel (1) LOGIC DIAGRAM TRUTH TABLE NOTE: 1. Expanded truth table included on ...

Page 4

Micrel DC ELECTRICAL CHARACTERISTICS LOGIC DIAGRAM (Min (Max.); Symbol Parameter I Input HIGH Current IH I Power Supply Current EE 10E 100E AC ELECTRICAL CHARACTERISTICS LOGIC DIAGRAM ...

Page 5

Micrel APPLICATIONS INFORMATION LOGIC DIAGRAM Overview The SY10E/100E136 are 6-bit synchronous, presettable, cascadable universal counters. Using the S pins, the user can select between preset, count up, count down and hold count. The Master Reset pin will reset the internal ...

Page 6

Micrel CLK Figure 2. Look-Ahead-Carry Input Structure Note from the waveforms that the look-ahead-carry output (CL ) pulses low one clock pulse before the counter OUT reaches terminal count. Also note that both CL ...

Page 7

Micrel LOAD CLOCK S1 C OUT The exercise of building a programmable divider then becomes simply determining what value to load into the counter to accomplish the desired division. Since the load operation requires a clock pulse, to divide by ...

Page 8

Micrel 28 LEAD PLCC (J28-1) MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA + 1 (408) 980-9191 TEL This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for ...

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