SP3508EB Exar Corporation, SP3508EB Datasheet - Page 29

• Manufacturer Part Number: SP3508EB
• Description: LIN Transceivers 20Mbps Multiprotocol Transceiver 8Ch 3.3V
• Manufacturer: Exar Corporation
• Series: -r

Specifications of SP3508EB

• Main Purpose: Interface, Transceiver RS-232, RS-449, EIA-530(A), X.21
• Embedded: No
• Utilized Ic / Part: SP3508
• Primary Attributes: Internal Line or Digital Loopback Testing
• Secondary Attributes: 8 Drivers and 8 Receivers
• Lead Free Status / Rohs Status: Details

Figure 48. Charge Pump - Phase 4.
2-phased inverter pump
Phase 1
Please refer to figure below: In the first phase of the clock cycle, switches S2 and S4 are
opened and S1 and S3 closed. This connects the flying capacitor, C3, from Vin to ground.
C3 charge up to the input voltage applied at Vcc.
Phase 2
In the second phase of the clock cycle, switches S2 and S4 are closed and S and S3 are
opened. This connects the flying capacitor, C3, in parallel with the output capacitor, C
The Charge stored in C3 is now transferred to C
C
across C
voltage at the V
Figure 49. Circuit for an Ideal Voltage Inverter.
VSS2
is connected to V
VSS2
smaller than the voltage across C3, the charge flows from C3 to C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com
SS2
V
equals -V
CC
SS2
C
and the positive side is connected to ground. With the voltage
1
+
–
CC
V
CC
.
= +3V
S
S
3
1
C
V
C
2
+6V
SS2
3
+
–
29
= -V
+
CC
VSS2
S
. Simultaneously, the negative side of
C
C
S
+
–
VDD
4
VSS1
2
+
–
V
V
DD
SS1
S tora ge C apacitor
+
S tora ge C apacitor
C
VSS2
V
SS2
SP3508_00_072208
FEATURES
VSS2
until the
VSS2
.