HD6437020 Datasheet, PDF (457/507 Pages) Hitachi Semiconductor – SuperH™ RISC engine

19.3 AC Characteristics
The following AC timing chart represents the AC characteristics, not signal functions. For signal
functions, see the explanation in the text.
19.3.1 Clock Timing
Table 19.4 Clock Timing
Case A: V_CC = 3.0 to 5.5 V, V_SS = 0 V, Ta = –20 to +75°C*
Case B: V_CC = 5.0 V ±10%, V_SS = 0 V, Ta = –20 to +75°C*
*: Normal products. Ta = –40 to +85°C for wide-temperature range products.
Item
EXTAL input high level
pulse width
EXTAL input low level
pulse width
EXTAL input rise time
EXTAL input fall time
Clock cycle time
Clock high pulse width
Clock low pulse width
Clock rise time
Clock fall time
Reset oscillation settling
time
Software standby
oscillation settling time
Case A
Case B
Sym- ^{12.5 MHz}
16.6 MHz 20 MHz
bol Min Max Min Max Min Max Unit Figures
t_EXH 20 —
10 —
10 —
ns
19.1
t_EXL 20 —
10 —
10 —
ns
t_EXr — 10
t_EXf — 10
t_cyc 80 —
t_CH 30 —
t_CL 30 —
t_Cr
— 10
t_Cf
— 10
t_OSC1 10 —
—5
—5
ns
—5
—5
ns
60 500 50 500 ns 19.1, 19.2
20 — 20 — ns 19.2
20 — 20 — ns
—5
—5
ns
—5
—5
ns
10 — 10 — ms 19.3
t_OSC2 10 —
10 —
10 —
ms
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