MAX3243EETJ+T Maxim Integrated, MAX3243EETJ+T Datasheet - Page 8

• Manufacturer Part Number: MAX3243EETJ+T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3221E, MAX3223E, MAX3243Er

Specifications of MAX3243EETJ+T

• Data Rate: 120 Kbps
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 1 mA
• Operating Temperature Range: 0 C to + 70 C
• Function: Transceiver
• Number Of Drivers: 3
• Number Of I/os: 16
• Number Of Receivers: 5
• Propagation Delay Time Ns: 0.3 us
• Shutdown: Yes

3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
Figure 1a. Output Load for AC Specification
Figure 1b. Fault Timing
8
*MURATA
BLM11HA102
_______________________________________________________________________________________
SHDNDRV
V
ID
OPTICAL
FAULT
POR
OUT
V
NOTE: TIMING IS NOT TO SCALE.
EN
CC
MODSET
IN+
IN-
t
PORDLY
R
MOD
I
CC
V
CC
MODULATION
MAX3286
MAX3296
FAULT ON MD
CONTROL
TC
50
t
FAULT
V
CC
OUT-
V
CC
t
EN_RESET
RESET BY EN SHUTDOWN
OUT+
FERRITE BEAD*
V
I
OUT
I
CC
MOD
t
RESET
50
3/2
EQUIVALENT
BIASDRV
(OPEN)
R
L
BY EN
0.01 F
LASER
t
L = 3.9nH
LOAD
SHUTDN
25
0.01 F
i
MOD
L = 3.9nH
R
L
= 25
The MAX3286/MAX3296 series of laser drivers contain a
bias generator with APC, laser modulator, power-on reset
(POR) circuit, and safety circuitry (Figures 2a and 2b).
Figure 3 shows the bias generator circuitry containing a
power-control amplifier, controlled reference voltage,
smooth-start circuit, and window comparator. The bias
generator combined with an external PNP or NPN transis-
tor provides DC laser current to bias the laser in a light-
emitting state. When there is a monitor diode (MD) in the
laser package, the APC circuitry adjusts the laser-bias
current to maintain average power over temperature and
changing laser properties. The MD input is connected to
_______________Detailed Description
V
ID
= V
CURRENT
IN+
VOLTS
- V
I
V
MOD
V
IN+
IN-
IN-
RESULTING SIGNAL
DIFFERENTIAL INPUT
TIME
Bias Generator
100mV
830mV
200mV
1660mV
P-P
P-P
P-P
P-P
MIN
MAX
MIN
MAX