Philips Semiconductors
Product specification
USB device with serial interface
PDIUSBD11
2
AC CHARACTERISTICS (I C pins)
All timing values are valid within the operating supply voltage and ambient temperature range and reference to V and V with an input voltage
IL
IH
swing of V and V
.
SS
DD
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
kHz
ms
F
S
clock frequency
1000
SCL
BUF
CL
t
Bus free time
0.5
t
Start condition set-up time
Start condition hold time
0.25
0.25
0.45
0.45
ms
SU;STA
HD;STA
t
ms
t
S
CL
S
CL
S
CL
S
CL
LOW time
HIGH time
ms
LOW
t
ms
HIGH
t
r
and S rise time
0.3
0.1
ms
DA
t
f
and S fall time
ms
DA
t
Data set-up time
Data hold time
100
0
ns
SU;DAT
HD;DAT
t
ns
t
S
LOW to data out valid
0.4
ms
VD;DAT
SU;STO
CL
t
Stop condition set-up time
0.25
ms
2
2
A detailed description of the I C-bus specification, with applications, is given in the brochure “The I C-bus and how to use it”. This brochure may
be ordered using the Philips order number 9398 393 40011.
STOP
CONDITION
(P)
BIT 7
MSB
(A7)
BIT 0
LSB
(R/W)
START
CONDITION
(S)
BIT 6
(A6)
ACKNOWLEDGE
(A)
PROTOCOL
t
t
t
HIGH
SU;STA
LOW
1/f
SCL
SCL
t
r
t
f
t
BUF
SDA
t
t
t
t
t
SU;STO
HD;STA
SU;DAT
HD;DAT
VD:DAT
SV00756
2
Figure 2. I C-bus timing diagram
14
1999 Jul 22
NXP [ NXP ]
