MT88E45
Data Sheet
Oscillator
The MT88E45B requires a 3.579545 MHz crystal or ceramic resonator to generate its oscillator clock. To meet the
CAS detection frequency tolerance specifications the crystal or resonator must have a 0.1% frequency tolerance.
The crystal specification is as follows: (e.g., CTS MP036S)
Frequency:
3.579545 MHz
± 0.1% (over temperature
range of the application)
Parallel
Frequency Tolerance:
Resonance Mode:
Load Capacitance:
Maximum Series
Resistance:
18 pF
150 Ω
Maximum Drive Level:
2 mW
Alternatively an external clock source can be used. In which case the OSC1 pin should be driven directly from a
CMOS buffer and the OSC2 pin left open.
For 5V+/-10% applications any number of MT88E45B’s can be connected as shown in Figure 6 6 so that only one
crystal is required.
MT88E45B
MT88E45B
MT88E45B
OSC1 OSC2
OSC1 OSC2
OSC1 OSC2
to the
next MT88E45B
(For 5V+/-10% applications only)
3.579545 MHz
Figure 6 - Common Crystal Connection
14
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
