IC MCU OTP 8BIT 1K 20DIP

COP8SAA720N9

Manufacturer Part NumberCOP8SAA720N9
DescriptionIC MCU OTP 8BIT 1K 20DIP
ManufacturerNational Semiconductor
SeriesCOP8™ 8SA
COP8SAA720N9 datasheet
 


Specifications of COP8SAA720N9

Core ProcessorCOP8Core Size8-Bit
Speed10MHzConnectivityMicrowire/Plus (SPI)
PeripheralsPOR, PWM, WDTNumber Of I /o16
Program Memory Size1KB (1K x 8)Program Memory TypeOTP
Ram Size64 x 8Voltage - Supply (vcc/vdd)2.7 V ~ 5.5 V
Oscillator TypeInternalOperating Temperature0°C ~ 70°C
Package / Case20-DIP (0.300", 7.62mm)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
Eeprom Size-Data Converters-
Other names*COP8SAA720N9
COP8SAA720N9B
COP8SAA720NB
  
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6.0 Functional Description
The contents of data registers and RAM are unknown fol-
lowing the on-chip reset.
FIGURE 10. Reset Timing (Power-On Reset Enabled)
with V
Tied to RESET
CC
DS012838-16
FIGURE 11. Reset Circuit Using Power-On Reset
6.8 OSCILLATOR CIRCUITS
There are four clock oscillator options available: Crystal
Oscillator with or without on-chip bias resistor, R/C Oscillator
with on-chip resistor and capacitor, and External Oscillator.
The oscillator feature is selected by programming the ECON
register, which is summarized in Table 2 .
TABLE 2. Oscillator Option
ECON4 ECON3
Oscillator Option
0
0
External Oscillator
1
0
Crystal Oscillator without Bias Resistor
0
1
R/C Oscillator
1
1
Crystal Oscillator with Bias Resistor
www.national.com
6.8.1 Crystal Oscillator
(Continued)
The crystal Oscillator mode can be selected by programming
ECON Bit 4 to 1. CKI is the clock input while G7/CKO is the
clock generator output to the crystal. An on-chip bias resistor
connected between CKI and CKO can be enabled by pro-
gramming ECON Bit 3 to 1 with the crystal oscillator option
selection. The value of the resistor is in the range of 0.5M to
2M (typically 1.0M). Table 3 shows the component values
required for various standard crystal values. Resistor R2 is
only used when the on-chip bias resistor is disabled. Figure
12 shows the crystal oscillator connection diagram.
TABLE 3. Crystal Oscillator Configuration,
R1 (k )
R2 (M )
0
1
0
1
0
1
5.6
1
6.8.2 External Oscillator
The External Oscillator mode can be selected by program-
ming ECON Bit 3 to 0 and ECON Bit 4 to 0. CKI can be
driven by an external clock signal provided it meets the
specified duty cycle, rise and fall times, and input levels.
G7/CKO is available as a general purpose input G7 and/or
Halt control. Figure 13 shows the external oscillator connec-
tion diagram.
6.8.3 R/C Oscillator
DS012838-15
The R/C Oscillator mode can be selected by programming
ECON Bit 3 to 1 and ECON Bit 4 to 0. In R/C oscillation
mode, CKI is left floating, while G7/CKO is available as a
general purpose input G7 and/or HALT control. The R/C
controlled oscillator has on-chip resistor and capacitor for
maximum R/C oscillator frequency operation. The maximum
frequency is 6 MHz
and temperature range of −40˚C to +85˚C. For max fre-
quency operation, the CKI pin should be left floating. For
lower frequencies, an external capacitor should be con-
nected between CKI and either V
R/C oscillator to external noise can be improved by connect-
ing one half the external capacitance to V
GND. PC board trace length on the CKI pin should be kept
as short as possible. Table 4 shows the oscillator frequency
as a function of approximate external capacitance on the
CKI pin. Figure 14 shows the R/C oscillator configuration.
TABLE 4. R/C Oscillator Configuration,
−40˚C to +85˚C, V
OSC Freq. Variation of
External Capacitor
(pF)
0
13
62
120
5600
18
T
= 25˚C, V
= 5V
A
CC
C1 (pF)
C2 (pF)
CKI Freq. (MHz)
30
30
15
32
32
10
45
30–36
4
100
100–156
0.455
±
35% for V
between 4.5V to 5.5V
CC
or GND. Immunity of the
CC
and one half to
CC
= 4.5V to 5.5V,
CC
±
35%
R/C OSC Freq
Instr. Cycle
(MHz)
(µs)
6
1.667
4
2.5
2
5.0
1
10
32 kHz
312.5