ZLF645E0Q2032G Maxim Integrated, ZLF645E0Q2032G Datasheet - Page 142

• Manufacturer Part Number: ZLF645E0Q2032G
• Description: 8-bit Microcontrollers - MCU Crimzon Flash Infrared MCU
• Manufacturer: Maxim Integrated

Specifications of ZLF645E0Q2032G

• Core: Z8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 1 KB
• On-chip Adc: No
• Operating Supply Voltage: 2 V to 3.6 V
• Package / Case: QFN-EP-20
• Mounting Style: SMD/SMT
• Interface Type: UART
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Programmable I/os: 5
• Number Of Timers: 2 x 8 bit, 1 x 16 bit
• On-chip Dac: No
• Processor Series: ZLF645
• Program Memory Type: Flash
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2 V

Clock
19-4572; Rev 0; 4/09
ZLF645 MCUs on-chip oscillator has a high-gain, parallel-resonant amplifier for 
connecting to a crystal, ceramic resonator, or any suitable external clock source 
(XTAL1 = Input, XTAL2 = Output).
Crystal Specification
The crystal must be AT cut, 1 MHz to 8 MHz (maximum), with a series resistance (RS)
less than or equal to 100
clock source.
The crystal must be connected across XTAL1 and XTAL2 pins using the recommended
capacitors from each pin to ground. The typical capacitor value is 10 pF for 8 MHz. Check
with the crystal supplier for the optimum capacitance.
Maxim’s IR MCU supports crystal, resonator, and oscillator. Most resonators have a
frequency tolerance of less than ±0.5%, which is enough for a remote control application.
Resonator has a very fast startup time, which is around few hundred microseconds. Most
crystals have a frequency tolerance of less than 50 ppm (±0.005%). However, crystal
needs longer startup time than the resonator. The large loading capacitance slows down the
oscillation startup time. Clock oscillation must be stable before the CPU begins instruction
execution. If oscillation is not present or not stable before the chip completes timeout of its
Power-On Reset (POR) period, the chip’s behavior could be indeterminate.
C1
C2
Ceramic Resonator or Crystal
C1, C2 = 10 pF *
f = 8 MHz
*Note: preliminary value, including pin parasitics.
XTAL1
XTAL2

Figure 41. Oscillator Configuration
. The on-chip oscillator can be driven with a suitable external
External Clock
XTAL1
XTAL2
ZLF645 Series Flash MCUs
Ceramic Resonator f = 8 MHz
Product Specification
XTAL1
XTAL2
Clock
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