Datasheet

Section 27 Electrical Characteristics
Rev. 3.00 Mar 21, 2006 page 754 of 788
REJ09B0300-0300
Table 27.24 Keyboard Buffer Controller Timing
Conditions: V
CC
= 4.0 V to 5.5 V, V
CC
= 2.7 V to 3.6 V (3-V product), V
CC
B = 2.7 V to 5.5 V,
V
SS
= 0 V, φ = 2 MHz to maximum operating frequency, T
a
= –20 to +75°C
Ratings
Item Symbol Min Typ Max Unit
Test
Conditions Notes
KCLK, KD output fall time t
KBF
20 + 0.1 Cb — 250 ns
KCLK, KD input data hold time t
KBIH
150 ——ns
KCLK, KD input data setup time t
KBIS
150 ——ns
KCLK, KD output delay time t
KBOD
——450 ns
KCLK, KD capacitive load C
b
——400 pF
Figure
27.28
Table 27.25 I
2
C Bus Timing
Conditions: V
CC
= 4.0 V to 5.5 V, V
CC
= 2.7 V to 3.6 V (3-V product), V
SS
= 0 V,
φ = 5 MHz to maximum operating frequency,
Ratings
Item Symbol Min Typ Max Unit
Test
Conditions
Notes
SCL input cycle time t
SCL
12 ——t
cyc
SCL input high pulse width t
SCLH
3 ——t
cyc
SCL input low pulse width t
SCLL
5 ——t
cyc
SCL, SDA input rise time t
Sr
——7.5
*
t
cyc
SCL, SDA input fall time t
Sf
——300 ns
SCL, SDA input spike pulse
elimination time
t
SP
——1t
cyc
SDA input bus free time t
BUF
5 ——t
cyc
Start condition input hold time t
STAH
3 ——t
cyc
Retransmission start condition
input setup time
t
STAS
3 ——t
cyc
Stop condition input setup time t
STOS
3 ——t
cyc
Data input setup time t
SDAS
0.5 ——t
cyc
Data input hold time t
SDAH
0 ——ns
SCL, SDA capacitive load C
b
——400 pF
Figure
27.29
Note: * 17.5t
cyc
can be set according to the clock selected for use by the I
2
C module. For details,
see section 16.6, Usage Notes.