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PDF MAX3320ABLT Data sheet ( Hoja de datos )
| Número de pieza | MAX3320ABLT | |
| Descripción | 3V to 5.5V / up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1253; Rev 0; 8/97
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
_______________General Description
The MAX3320 combines a microprocessor (µP) super-
visory circuit with an RS-232 transceiver. The power-on
reset performs a single function: it asserts a reset signal
whenever the VCC supply voltage declines below a pre-
set threshold, staying asserted for at least 100ms after
VCC rises above the reset threshold. The MAX3320 has
an active-low RESET output, which is guaranteed to be in
the correct state for VCC down to 1V. The reset compara-
tor is designed to ignore fast transients on VCC. Reset
thresholds suitable for operation with a variety of supply
voltages are available.
The MAX3320 transceivers have a proprietary low-
dropout transmitter output stage, enabling true RS-232
performance with a dual charge pump powered from a
+3V to +5.5V supply. The device requires only four
small 0.1µF external charge-pump capacitors, and is
guaranteed to run at data rates of up to 250kbps. It
comes in the space-saving 20-pin SSOP package.
________________________Applications
Palmtop Computers
Portable/Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
____________________________Features
o Precise Monitoring of 5V and 3.3V Power-
Supply Voltages:
— 100ms (min) Power-On RESET Pulse Width
— Power-Supply Transient Immunity
— Guaranteed RESET Valid to VCC = 1V
o 4µA Supply Current Achieved with
AutoShutdown Plus
o Receivers Always Active
o Power-On Reset Always Active
o 4µA Low-Power Shutdown
o 250kbps Guaranteed Data Rate
______________Ordering Information
PART*
MAX3320_CAP
MAX3320_EAP
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
20 SSOP
20 SSOP
* This part offers a choice of reset threshold voltage. From the
table below, select the suffix corresponding to the desired
threshold and insert it into the blank to complete the part
number.
__________________Pin Configuration
TOP VIEW
V+ 1
C2+ 2
C2- 3
V- 4
T1IN 5
T2IN 6
R1OUT 7
R2OUT 8
INVALID 9
RESET 10
MAX3320
MAXxxx
20 C1+
19 VCC
18 C1-
17 GND
16 T1OUT
15 T2OUT
14 R1IN
13 R2IN
12 FORCEON
11 FORCEOFF
SUFFIX
A
B
L
T
RESET THRESHOLD
(V)
4.25
2.85
4.63
3.08
Typical Operating Circuit appears at end of data sheet.
SSOP
AutoShutdown Plus is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 page  
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
____________________________Typical Operating Characteristics (continued)
(VCC = 3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ. Typical values are at TA = +25°C, unless
otherwise noted.)
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
300
250
SHUTDOWN MODE
200
150
100 NOT IN
SHUTDOWN
50 MODE
CBYPASS = 0.1µF
0
10 100
1000
RESET COMPARATOR OVERDRIVE (mV)
NORMALIZED POWER-UP RESET
DELAY vs. TEMPERATURE
1.040
1.030
1.020
1.010
1.000
0.990
0.980
0.970
0.960
-40 -20
0
20 40 60 80
TEMPERATURE (°C)
______________________________________________________________Pin Description
PIN
1
2
3
4
5, 6
7, 8
9
10
11
12
13, 14
15, 16
17
18
19
20
NAME
V+
C2+
C2-
V-
T_IN
R_OUT
INVALID
RESET
FORCEOFF
FORCEON
R_IN
T_OUT
GND
C1-
VCC
C1+
FUNCTION
5.5V generated by the charge pump
Positive terminal of inverting charge-pump capacitor
Negative terminal of inverting charge-pump capacitor
-5.5V generated by the charge pump
TTL/CMOS Transmitter Inputs (T1IN and T2IN)
TTL/CMOS Receiver Outputs (R1OUT and R2OUT)
Output of the Valid Signal Detector. Asserts when no valid RS-232 levels are present on any of
the receiver inputs for 90µs.
RESET Output. RESET remains low while VCC is below the reset threshold, and for 280ms (max)
after VCC rises above the reset threshold.
Force-Off Input. Drive FORCEOFF low to shut down transmitters and on-board power supply.
This overrides AutoShutdown Plus and FORCEON (Table 1).
Force-On Input. Drive FORCEON high to override AutoShutdown Plus, keeping transmitters on
(FORCEOFF must be high) (Table 1).
RS-232 Receiver Inputs (R2IN and R1IN)
RS-232 Transmitter Outputs (T2OUT and T1OUT)
Ground
Negative terminal of voltage-doubler charge-pump capacitor
+3V to +5.5V Supply Voltage
Positive terminal of voltage-doubler charge-pump capacitor
_______________________________________________________________________________________ 5
5 Page 
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
___________________________________________________Typical Operating Circuit
+3.3V
VCC
VCC
µP
SYSTEM
RESET
INPUT
C1
0.1µF
C2
0.1µF
0.1µF
C1+ VCC
V+
C1-
C2+ MAX3320
V-
C2-
T1IN T1 T1OUT
T2IN T2 T2OUT
FORCEOFF
FORCEON
AUTOSHUTDOWN
PLUS
R1OUT
R1
R2OUT
RESET
INVALID
R2
GND
R1IN
5k
R2IN
5k
C3*
0.1µF
C4
0.1µF
RS-232
OUTPUTS
RS-232
INPUTS
*C3 MAY BE RETURNED TO EITHER VCC OR GND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3320ABLT.PDF ] | |
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