Datasheet

TL16C750
ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH 64-BYTE FIFOs AND AUTOFLOW CONTROL
SLLS191C – JANUARY 1995 – REVISED DECEMBER 1997
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
system timing requirements over recommended ranges of supply voltage and operating free-air
temperature
PARAMETER ALT. SYMBOL FIGURE TEST CONDITIONS MIN MAX UNIT
t
cR
Cycle time, read (t
w7
+ t
d8
+ t
d9
) RC 87 ns
t
cW
Cycle time, write (t
w6
+ t
d5
+ t
d6
) WC 87 ns
t
w1
Pulse duration, clock (XIN) high t
XH
4 f = 16 MHz maximum 25 ns
t
w2
Pulse duration, clock (XIN) low t
XL
4 f = 16 MHz maximum 25 ns
t
w5
Pulse duration, ADS low t
ADS
5, 6 9 ns
t
w6
Pulse duration, write strobe t
WR
5 40 ns
t
w7
Pulse duration, read strobe t
RD
6 40 ns
t
w8
Pulse duration, MR t
MR
1 µs
t
su1
Setup time, address valid before ADS↑ t
AS
5, 6 8 ns
t
su2
Setup time, CS valid before ADS↑ t
CS
5, 6 8 ns
t
su3
Setup time, data valid before WR1↓ ↑
t
DS
5 15 ns
t
su4
†
Setup time, ↑ before midpoint of stop bit
16 10 ns
t
h1
Hold time, address low after ADS↑ t
AH
5, 6 0 ns
t
h2
Hold time, CS valid after ADS↑ t
CH
5, 6 0 ns
t
h3
Hold time, CS valid after WR1↑ ↓
t
WCS
5 10 ns
t
h4
†
Hold time, address valid after WR1↑ ↓
t
WA
5 10 ns
t
h5
Hold time, data valid after WR1↑ ↓
t
DH
5 5 ns
t
h6
Hold time, CS valid after RD1↑ or RD2↓
t
RCS
6 10 ns
t
h7
†
Hold time, address valid after RD1↑ or RD2↓ t
RA
6 20 ns
t
d4
†
Delay time, CS valid before WR1↓ or WR2↑ t
CSW
5 7 ns
t
d5
Delay time, address valid before WR1↓ or WR2↑ t
AW
5 7 ns
t
d6
†
Delay time, write cycle, WR1↑ or WR2↓ to ADS↓ t
WC
5 40 ns
t
d7
†
Delay time, CS valid to RD1↓ or RD2↑ t
CSR
6 7 ns
t
d8
†
Delay time, address valid to RD1↓ or RD2↑ t
AR
6 7 ns
t
d9
Delay time, read cycle, RD1↑ or RD2↓ to ADS↓ tRC 6 40 ns
t
d10
Delay time, RD1↓ or RD2↑ to data valid t
RVD
6 C
L
= 75 pF 45 ns
t
d11
Delay time, RD1↑ or RD2↓ to floating data t
HZ
6 C
L
= 75 pF 20 ns
†
Only applies when ADS is low
system switching characteristics over recommended ranges of supply voltage and operating
free-air temperature (see Note 9)
PARAMETER ALT. SYMBOL FIGURE TEST CONDITIONS MIN MAX UNIT
t
dis(R)
Disable time, RD1↓↑ ↑↓ to DDIS↑↓ t
RDD
6 C
L
= 75 pF 20 ns
NOTE 9: Charge and discharge times are determined by V
OL
, V
OH
, and external loading.
baud generator switching characteristics over recommended ranges of supply voltage and
operating free-air temperature, C
L
= 75 pF
PARAMETER ALT. SYMBOL FIGURE TEST CONDITIONS MIN MAX UNIT
t
w3
Pulse duration, BAUDOUT low t
LW
4 f = 16 MHz, CLK ÷ 2 50 ns
t
w4
Pulse duration, BAUDOUT high t
HW
4 f = 16 MHz, CLK ÷ 2 50 ns
t
d1
Delay time, XIN↑ to BAUDOUT↑ t
BLD
4 45 ns
t
d2
Delay time, XIN↑↓ to BAUDOUT↓ t
BHD
4 45 ns