SP207HEP datasheet(5/14 Pages) SIPEX

Part #	SP207HEP

Description	5V High-Speed RS-232 Transceivers

Download	14 Pages

Scroll/Zoom	100%

Manufacturer	SIPEX [Sipex Corporation]

Direct Link	http://www.sipex.com

Logo

5 / 14 page

5

TGoddard/SP207H/9614R0

SP207H/SP211H High–Speed Transceivers

Figure 2. Charge Pump — Phase 2

negative side of capcitor C

2. There is a free–

running oscillator that controls the four phases

of the voltage shifting. A description of each

phase follows.

Phase 1

— V

SS charge storage —During this phase of the

clock cycle, the positive side of capacitors C

1

and C

2 are initially charged to +5V. Cl

+ is then

switched to ground and the charge in C

1

– is

transferred to C

2

–. Since C

2

+ is connected to

+5V, the voltage potential across capacitor C

2 is

now 10V.

Phase 2

— V

SS transfer — Phase two of the clock con-

nects the negative terminal of C

2 to the VSS

storage capacitor and the positive terminal of C

2

to ground, and transfers the generated –l0V to

C

3. Simultaneously, the positive side of capaci-

tor C

1 is switched to +5V and the negative side

is connected to ground.

Phase 3

— V

DD charge storage — The third phase of the

clock is identical to the first phase — the charge

transferred in C

1 produces –5V in the negative

terminal of C

1, which is applied to the negative

side of capacitor C

2. Since C2

+ is at +5V, the

voltage potential across C

2 is l0V.

Phase 4

— V

DD transfer — The fourth phase of the clock

connects the negative terminal of C

2 to ground,

and transfers the generated l0V across C

2 to C4,

the V

DD storage capacitor. Again, simultaneously

with this, the positive side of capacitor C

1 is

switched to +5V and the negative side is con-

nected to ground, and the cycle begins again.

Since both V+ and V– are separately generated

from V

CC; in a no–load condition V

+ and V– will

be symmetrical. Older charge pump approaches

that generate V– from V+ will show a decrease in

the magnitude of V– compared to V+ due to the

inherent inefficiencies in the design.

The clock rate for the charge pump typically

operates at 15kHz. The external capacitors can

be as low as 0.1

µF with a 16V breakdown

voltage rating.

Transmitter/Driver

The drivers are inverting transmitters which have

been improved for speed over the SP200 Series.

The transmitters accept either TTL or CMOS

inputs and output the RS-232 signals at data rates

over 400kbps. Typically, the RS-232 output volt

VCC = +5V

–5V

+5V

VSS Storage Capacitor

VDD Storage Capacitor

C1

C2

C3

C4

+

++

–

Figure 1. Charge Pump — Phase 1

VCC = +5V

–10V

VSS Storage Capacitor

VDD Storage Capacitor

C1

C2

C3

C4

+

++

–

Similar Part No. - SP207HEP

Manufacturer	Part #	Datasheet	Description
Sipex Corporation	SP207HEP	216Kb / 14P	5V High-Speed RS-232 Transceivers

More results

Similar Description - SP207HEP

Manufacturer	Part #	Datasheet	Description
Sipex Corporation	SP207H	216Kb / 14P	5V High-Speed RS-232 Transceivers
	SP200	263Kb / 16P	5V High-Speed RS-232 Transceivers with 0.1mF Capacitors
	SP200	213Kb / 15P	5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
Exar Corporation	SP211CA-L-TR	1Mb / 15P	5V RS-232 Serial Transceivers
	SP211ECA-L-TR	1Mb / 15P	5V RS-232 Serial Transceivers
	SP211EEA-L-TR	1Mb / 15P	5V RS-232 Serial Transceivers
	SP208ECA-L-TR	1Mb / 15P	5V RS-232 Serial Transceivers
	SP206	1Mb / 14P	5V RS-232 Serial Transceivers
	SP213EHCA	995Kb / 19P	Low Power, High ESD 5V RS-232 Transceivers
	SP207ECA-L-TR	1Mb / 19P	Low Power, High ESD 5V RS-232 Transceivers

More results

SP207HEP Datasheet(PDF) 5 Page - Sipex Corporation

SP207HEP Datasheet(HTML) 5 Page - Sipex Corporation

Similar Part No. - SP207HEP

Similar Description - SP207HEP

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Datasheet Download

Link URL