Datasheet

PCA9600 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 5 — 5 May 2011 13 of 31
NXP Semiconductors
PCA9600
Dual bidirectional bus buffer
For more examples of faster alternatives for driving over longer cables such as Cat5
communication cable, see AN10658. Communication at 1 MHz is possible over short
cables and > 400 kHz is possible over 50 m of cable.
Fig 14. Driving ribbon or flat telephone cables
PCA9600
SCL
RX
TX
002aac85
1
SX
V
CC
TY
RY
SY
R2
R2
C2C2
I
2
C-BUS
MASTER
SDA
V
CC1
GND
R1 R1
BAT54A
cable
propagation
delay ≈ 5 ns/m
BAT54A
R1 R1
PCA9600
RX
TX
TY
RY
V
CC
SX
SY
R2
R2
SCL
SDA
V
CC2
GND
I
2
C-BUS
SLAVE(S)
C2C2
+V cable drive
Table 7. Examples of bus capability
Refer to Figure 14
.
V
CC1
(V)
+V
cable
(V)
V
CC2
(V)
R1
(Ω)
R2
(kΩ)
C2
(pF)
Cable
length
(m)
Cable
capacitance
Cable
delay
Set master
nominal SCL
Effective
bus
clock
speed
(kHz)
Max. slave
response
delay
HIGH
period
(ns)
LOW
period
(ns)
5 12 5 750 2.2 400 250 n/a
(delay based)
1.25 μs 600 3850 125 normal
specification
400 kHz parts
5 12 5 750 2.2 220 100 n/a
(delay based)
500 ns 600 2450 195 normal
specification
400 kHz parts
3.3 5 3.3 330 1 220 25 1 nF 125 ns 260 770 620 meets Fm+
specification
3.3 5 3.3 330 1 100 3 120 pF 15 ns 260 720 690 meets Fm+
specification