CGS3311M Просмотр технического описания (PDF) - Fairchild Semiconductor
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CGS3311M Datasheet PDF : 7 Pages
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Truth Tables
Division Selection
DIVB DIVA OEL
F 0/F X
1
0/F 0
0
0/F 0
F
1
0
1
1
0
0
1
0
XX1
XXX
OEH
X
1
1
1
1
1
X
0
Divider Output
Divide-by 1
Divide-by 2
Divide-by 4
Divide-by 8
Divide-by 16
Divide-by 32
Output Reset HIGH
at Re-enable
Output Reset HIGH
at Re-enable
Note: Actual value of the floating OSC_DR and DIVB input is VCC/2
Pin Descriptions
Rise and Fall Time Selection
OSC_DR DIV TRF Rise/Fall Time (ns)
F
N 0/F 2
F
N 1 less than 2
F
Y 0/F 4
F
Y1 2
0,1
X 0/F 4
0,1
X1 2
Drive Selection
OSC_DR
0
1
F
Drive
Low
Medium
High
Note: Where “F” indicates floating the input.
Note: Pin out varies for each device.
OSC_IN Input to Oscillator Inverter. The output of the
crystal would be connected here.
OEL
OSC_OUT Resistive Buffered Output of the Oscillator
TRF
Inverter
OSC_DR 3 Level input pin that selects Oscillator Drive OUT
Level
DIVA
Input used to select Binary Divide-by Option. OSCLO_1
This pin has CMOS compatible input levels.
OEH
Active HIGH 3-STATE enable pin. This pin pulls OSCLO_2
to a high value when left floating and 3-STATEs
the output when forced low. This pin has TTL
compatible input levels.
VCC
GND
Active LOW 3-STATE enable pin. This pin pulls
to a low value when left floating and 3-STATE
the output when forced HIGH. This pin has TTL
compatible input levels.
Rise and Fall time override pin. Available only
for die form.
This pin is the main clock output on the device.
The Oscillator LOW pin is the ground for the
Oscillator.
This pin is the same signal as OSCLO_1. It has
been provided as an alternate connection for
OSCLO_1 for hybrid assemblies.
The power pin for the chip.
The ground pin for all sections of the circuitry
except the oscillator and oscillator related
circuitry.
Functional Table
Summary of Device Options
Device
3311
3312
3313
3314
3315
3316
3317
3318
3319
Divide
1, 2, 4
1, 2, 4
8, 16, 32
8, 16, 32
1, 2, 4
4
32
1, 2, 4
1, 2, 4
Enable
OEH
OEH
OEH
OEH
OEL
OEH
OEH
OEH
OEL
Drive
L, M, H
H
H
L, M, H
H
H
H
H
L, M, H
Output Rise/
Fall Time (ns)
2, 4
2, 4
4
4
1, 2
4
4
1, 2
2, 4
Each drive has one output with the choices of selecting frequency divide,
output enable, crystal drive and output rise and fall time. Crystal drive
options are:
L = LOW Drive
M = MEDIUM Drive
H = HIGH Drive
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