MF8CCJ National Semiconductor, MF8CCJ Datasheet - Page 8

• Manufacturer Part Number: MF8CCJ
• Manufacturer: National Semiconductor

Specifications of MF8CCJ

• Architecture: Switched Capacitor
• Cutoff Frequency: 20KHz
• Dual Supply Voltage (typ): ±5V
• Power Supply Requirement: Single/Dual
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Package Type: MDIP
• Lead Free Status / RoHS Status: Not Compliant

1 0 Application Information
1 2 CLOCKS
The MF8 has two clock input pins one for CMOS logic lev-
els and the other for TTL levels The TTL (pin 7) input auto-
matically adjusts its switching threshold to enable operation
on either single or split power supplies When this input is
used the CMOS logic input should be connected to pin
11(V
CMOS logic levels When it is used the TTL input should be
connected to either pin 11 (V
clock hookups for single and split supply operation are
shown in Figures 3 and 4
b
(a) MF8 Driven with CMOS Logic Level Clock
) The CMOS Schmitt trigger input at pin 8 accepts
b
) or pin 12 (V
FIGURE 2c Multiple Feedback Loop Connection
(c) MF8 Driven with Schmitt Trigger Oscillator
a
FIGURE 3 Dual Supply Operation
(Continued)
) The basic
TL H 8694– 7
8
Clock signals derived from a crystal-controlled oscillator are
recommended when maximum center frequency accuracy
is desired but in less critical applications the MF8 can gen-
erate its own clock signal as in Figures 3c and 4c An exter-
nal resistor and capacitor determine the oscillation frequen-
cy Tolerance of these components and part-to-part varia-
tions in Schmitt-trigger logic thresholds limit the accuracy of
the RC clock frequency In the self-clocked mode the TTL
Clock input should be connected to either pin 11 or pin 12
(b) MF8 Driven with TTL Logic Level Clock
f
Typically for V
f
TL H 8694 – 9
CLK
CLK
V
S
e
e
e
V
RC ln
1 69 RC
a
1
b
S
V
V
V
b
TL H 8694 – 6
S
S
e
b
b
10V
V
V
1
T
T
b
a
TL H 8694 – 8
V
V
T
T
a
b