TMS320P15 datasheet(71/146 Pages) TI

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TA = – 40°C to 85°C

TMS320LC15

DIGITAL SIGNAL PROCESSOR

SPRS009C – JANUARY 1987 – REVISED JULY 1991

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77001

CLOCK CHARACTERISTICS AND TIMING

The

′LC15 can use either its internal oscillator or an external frequency source for a clock.

internal clock option

The internal oscillator is enabled by connecting a crystal across X1 and X2/CLKIN (see Figure 1). The frequency

of CLKOUT is one-fourth the crystal fundamental frequency. The crystal should be fundamental mode, and

parallel resonant, with an effective series resistance of 30 ohms, a power dissipation of 1 mW, and be specified

at a load capacitance of 20 pF.

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

Crystal frequency fx

4.0

MHz

C1, C2

external clock option

An external frequency source can be used by injecting the frequency directly into X2/CLKIN with X1 left

unconnected. The external frequency injected must conform to the specifications listed in the table below.

switching characteristics over recommended operating conditions

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

tc(C)

CLKOUT cycle time†

250

1000

tr(C)

CLKOUT rise time

RL = 825 Ω,

10‡

tf(C)

CLKOUT fall time

CL = 100 pF,

8‡

tw(CL)

Pulse duration, CLKOUT low

(see Figure 2)

117‡

tw(CH)

Pulse duration, CLKOUT high

115‡

td(MCC) Delay time, CLKIN↑ to CLKOUT↓

timing requirements over recommended operating conditions

MIN

NOM

MAX

UNIT

tc(MC)

Master clock cycle time

62.5

150

tr(MC)

Rise time, master clock input

5‡

10†

tf(MC)

Fall time, master clock input

5‡

10†

tw(MCP) Pulse duration, master clock

0.4 t c(MC)‡

0.6 t c(MC)‡

tw(MCL) Pulse duration, master clock low at tc(MC) min

tw(MCH) Pulse duration, master clock high at tc(MC) min

† tc(C) is the cycle time of CLKOUT, i.e., 4tc(MC) (4 times CLKIN cycle time if an external oscillator is used)

‡ Values derived from characterization data and not tested.

TMS320P15 Datasheet(PDF) 71 Page - Texas Instruments

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