參數(shù)資料
型號(hào)： MAX3218EPP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩
中文描述： LINE TRANSCEIVER, PDIP20
封裝： 0.300 INCH, PLASTIC, DIP-20
文件頁(yè)數(shù)： 6/12頁(yè)
文件大小： 123K
代理商： MAX3218EPP
M
Diode Selection
Key diode specifications are fast recovery time (<10ns),
average current rating (>100mA), and peak current rat-
ing (>350mA). Inexpensive fast silicon diodes, such as
the 1N6050, are generally recommended. More expen-
sive Schottky diodes improve efficiency and give slightly
better performance at very low V
CC
voltages. Table 1
lists suppliers of both surface-mount and through-hole
diodes. 1N914s are usually satisfactory, but specifica-
tions and performance vary widely with different manu-
facturers.
Capacitor Selection
Use capacitors with values at least as indicated in
Figure 1. Capacitor C2 determines the ripple on V+, but
not the absolute voltage. Capacitors C1 and C3 deter-
mine both the ripple and the absolute voltage of V-.
Bypass V
CC
to GND with at least 1μF (C4) placed close
to pins 5 and 6. If the V
CC
line is not bypassed else-
where (e.g., at the power supply), increase C4 to 4.7μF.
You may use ceramic or polarized capacitors in all
locations. If you use polarized capacitors, tantalum
types are preferred because of the high operating fre-
quency of the power supplies (about 250kHz). If alu-
minum electrolytics are used, higher capacitance
values may be required.
1μA S upply Current, 1.8V to 4.25V-Powered
RS -232 Transc eiver with AutoS hutdown
6
_______________________________________________________________________________________
MANUFACTURER
PHONE
PART NUMBER
FAX
USA (814) 237-1431
LQH4N150K-TA
Murata-Erie
USA (814) 238-0490
USA (708) 956-0666
J apan (03) 3607-5111
CD43150
Sumida
USA (708) 956-0702
J apan (03) 3607-5428
USA (508) 853-5000
USA (516) 435-1110
USA (408) 749-0510
USA (401) 762-3800
TMPD6050LT
CMPSH-3 (Schottky)
MMBD6050LT1 (silicon)
PMBD6050 (silicon)
Allegro
Central Semiconductor
Motorola
Philips
Diodes—Through-Hole
USA (508) 853-7556
USA (516) 435-1824
USA (408) 991-7420
USA (401) 767-4493
USA (708) 803-6100
J apan (03) 3278-5111
NLC453232T-150K
TDK
USA (708) 803-6296
J apan (03) 3278-5358
USA (408) 749-0510
1N6050 (silicon),
1N5817 (Schottky)
Motorola
USA (408) 991-7420
Table 1. Suggested Component Suppliers
GND
T2
T1
T2OUT
R1IN
R2IN
T1OUT
C1-
C1+
V-
T2IN
R1OUT
R2OUT
T1IN
14
18
C3
1
μ
F
C1
0.47
μ
F
C4
1
μ
F
C2
1
μ
F
16
15
13
12
11
5, 17, 20
V
CC
3
6
1
19
V+
4
2
7
8
9
10
1.8V to
4.25V
LX
15
μ
H
1N6050
FORCEON
INVALID
FORCEOFF
5k
5k
R1
R2
MAX3218
Figure 1. Typical Operating Circuit
Inductors
Diodes—Surface-Mount
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