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参数资料
| 型号： | SP708TEN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISORY CIRCUIT 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.08V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
S P 7 0 6 R / S / T - S P 7 0 8 R / S / T
3 . 0 V / 3 . 3 V L o w P o w e r M i c r o p r o c e s s o r S u p e r v i s o r y
C i r c u i t s
resistors and transistor as shown, a HIGH PFO
triggers RESET. As long as PFO remains HIGH,
the SP706R/S/T-SP708R/S/T series will keep
RESET asserted (where RESET = LOW and
RESET = HIGH). Note that this circuit's
accuracy depends on the PFI threshold
tolerance, the V CC line, and the resistors.
I NTERFACING TO μ P S WITH B IDIRECTIONAL
RESET P INS
μPs with bidirectional RESET pins, such as the
Motorola 68HC11 series, can contend with the
SP705/706/707/708 RESET output. If, for
example, the RESET output is driven HIGH and
the μP wants to pull it LOW, indeterminate
logic levels may result. To correct this,
connect a 4.7K ? resistor between the RESET
output and the μP reset I/O, as shown if
Figure 23. Buffer the RESET output to other
system components.
Fig. 21: Monitoring +3.3V/+3.0V and +12V Power
Supplies
Fig. 23: Interfacing to Microprocessors
with Bidirectional RESET I/O (SP706)
N EGATIVE -G OING V CC T RANSIENT
While issuing resets to the μ P during power-
up, power-down, and brownout conditions,
these supervisors are relatively immune to
short duration negative-going VCC transients
(glitches). It is usually undesirable to reset the
μ P when V CC experiences only small glitches.
Figure 24 shows maximum transient duration
vs. reset-comparator overdrive, for which
reset pulses are not generated. The data was
generated using negative-going V CC pulses,
starting at 3.3V and ending below the reset
threshold by the magnitude indicated (reset
comparator overdrive). The graph shows the
maximum pulse width a negative-going V CC
transient may typically have without causing a
reset pulse to be issued. As the amplitude of
Fig. 22: Monitoring a Negative Voltage Supply
the transient increases (i.e. goes farther below
? 2010 Exar Corporation
12/16
Rev. 2.0.0
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