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7641 Datasheet(PDF) 95 Page - Renesas Technology Corp

Part # 7641
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  138 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7641 Datasheet(HTML) 95 Page - Renesas Technology Corp

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7641 Group
Rev.4.00
Aug 28, 2006
page 95 of 135
REJ03B0191-0400
Fig. 79 Circuit for measuring output switching characteristics (1)
Notes 1: Test conditions: IOHL =
± 5mA, CL = 50 pF
2: twL(RD) = ((n + 0.5) • tc(PHI)) – 5 ns (n = wait number)
twL(WR) = ((n + 0.5) • tc(PHI)) – 5 ns (n = wait number)
For example, two software waits, PHI = 12 MHz operating
twL(RD) = 2.5 • tc(PHI) – 5 ns = 203.33 ns
Measurement output pin
100
pF
CMOS output
N-channel open-drain output (Note)
1 k
Ω
100 pF
Measurement output pin
Note: This diagram applies when bit 7 of the serial I/O control
register 1 is “1”.
Fig. 80 Circuit for measuring output switching characteristics (2)



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