NPC SM5838AS Datasheet
SM5838AS
NIPPON PRECISION CIRCUITS INC.
OVERVIEW
The SM5838AS is a 5120 × 8-bit synchronous FIFO
(first in, first out) high-speed line buffer. Internally, it
employs static CMOS circuits which mean that it
effectively has limitless data hold times. It can operate at speeds up to 33.3 MHz (normal-voltage specification).
The SM5838AS can be used to easily realize a 1-line
delay in high-speed facsimile machines and digital
copiers.
FEATURES
■
5120 × 8-bit structure
■
Variable-length delay (21 to 5120 bits)
■
33.3 MHz high-speed operation (normal-voltage
specification)
■
All input/outputs TTL compatible
■
Independent read enable and output enable pins,
allowing read address pointer increment in output
data hold and output high-impedance states
■
Supply voltage
• 4.5 to 5.5 V (normal-voltage specification)
• 3.0 to 4.5 V (low-voltage specification)
■
24-pin SOP package
■
Molybdenum-gate CMOS process
■
A3-paper 1-line (16 dots/mm) compatible
5120 × 8-bit Synchronous FIFO
PINOUT
(TOP VIEW)
DOUT0
DOUT1
DOUT2
DOUT3
OE
RR
VSS
RE
DOUT4
DOUT5
DOUT6
DOUT7
1
2
3
4
5
6
718
8
9
10
11
12
SM5838AS
24
DIN0
23
DIN1
DIN2
22
21
DIN3
20
WE
19
RW
VDD
CLK
17
16
DIN4
DIN5
15
14
DIN6
DIN7
13
PACKAGE DIMENSIONS
24-pin SOP (Unit: mm)
15.8TYP
0.915
1.27 0.1
0.6MAX
8.4TYP
11.8 0.3
010
1.0 0.2
+ 0.10
0.4
- 0.05
2.5MAX
0.10MIN
0.17
+ 0.08
- 0.07
NIPPON PRECISION CIRCUITS—1
BLOCK DIAGRAM
SM5838AS
DIN
8
8
Input buffer
32 32 8
SRAM
S/P converter
Decoder
Cache
WE
RW
CLK
Write address pointer Read address pointer
PIN DESCRIPTION
Number Name I/O Function
1 DOUT0 O Read data output bit 0
2 DOUT1 O Read data output bit 1
3 DOUT2 O Read data output bit 2
4 DOUT3 O Read data output bit 3
5OE
6RRI Reset read input
7 VSS – Ground (0 V) pin
8REI Read enable input (read address pointer)
9 DOUT4 O Read data output bit 4
10 DOUT5 O Read data output bit 5
11 DOUT6 O Read data output bit 6
12 DOUT7 O Read data output bit 7
13 DIN7 I Write data input bit 7
14 DIN6 I Write data input bit 6
15 DIN5 I Write data input bit 5
16 DIN4 I Write data input bit 4
17 CLK I Clock input
18 VDD – Supply pin
19 RW I Reset write input
20 WE I Write enable input (write address pointer)
21 DIN3 I Write data input bit 3
22 DIN2 I Write data input bit 2
23 DIN1 I Write data input bit 1
24 DIN0 I Write data input bit 0
I Output enable input
P/S converter
8
Output buffer
DOUT
OE
RE
RR
NIPPON PRECISION CIRCUITS—2
−
−
−
°
°
−
° C
SPECIFICATIONS
Absolute Maximum Ratings
V
= 0 V
SS
Parameter Symbol Condition Rating Unit
Supply voltage range V
Input voltage range V
Storage temperature range T
Power dissipation P
Soldering temperature T
Soldering time t
Recommended Operating Conditions
DD
IN
stg
D
sld
sld
µ
SM5838AS
0.3 to 7.0 V
V
SS
0.3 to V
+ 0.3 V
DD
40 to 125
C
500 mW
255
C
10 s
V
= 0 V
SS
Parameter Symbol Condition
min typ max
Normal-voltage specification 4.5 5.0 5.5 V
Supply voltage range V
Operating temperature T
DD
opr
Low-voltage specification 3.0 3.3 4.5 V
20 – 70
DC Characteristics
Parameter Symbol Condition
Operating current
consumption
Standby current
consumption
Input leakage current
Input leakage current
Input voltage
Input voltage
Output high-impedance
leakage current
Output voltage
2
3
2
3
4
4
I
DD
I
ST
I
LH
I
LL
V
V
I
ZH
I
ZL
V
OH
V
OL
IH
IL
No output load
V
= V
IN
V
= 0 V ––1––1 µ A
IN
OE
= HIGH, V
OE
= HIGH, V
I
= − 1 mA 2.5 – – 2.0 – –
OH
I
= 2 mA – – 0.4 – – 0.8
OH
1
DD
= V
OUT
DD
= 0 V ––5––5
OUT
1. Normal-voltage specification (CLK = 33.3 MHz); Low-voltage specification (CLK = 20 MHz, V
2. Pins CLK, RR
and RE.
3. Pins DIN0 to DIN7, RW, WE and OE.
4. Pins DOUT0 to DOUT7.
5 V supply 3 V supply
min typ max min typ max
–7590–2230mA
––50––50 µ A
––1––1 µ A
2.4 – – 2.0 – – V
– – 0.5 – – 0.5 V
––5––5
= 3.3 ± 0.3 V)
DD
Rating
Unit
Unit
A
V
Input/Outputs
Ta = 25 ° C, f = 1 MHz
Parameter Symbol Condition
Input capacitance C
Output capacitance C
Rating
Unit
min typ max
I
O
– – 10 pF
– – 10 pF
NIPPON PRECISION CIRCUITS—3
AC Characteristics
,,,,,,
,,,,,,
,,,,,,
Input timing
SM5838AS
Parameter Symbol Condition
5 V supply 3 V supply
min typ max min typ max
Clock cycle time t
Clock pulsewidth t
CKW
Input data setup time t
Input data hold time t
R
W and RR setup time t
R
W and RR hold time t
WE
setup time t
WE
hold time t
RE
setup time t
RE
hold time t
OE
setup time t
OE
hold time t
WES
WEH
RES
REH
OES
OEH
Rise and fall transition times t
1. All voltages measured with relative to V
2. Input timing input voltage levels are V
3. Input signal reference level is V
4. Input timing ratings measured with t
= 1.5 V.
TH
IL
= 5 ns.
T
CK
DS
DH
RS
RH
T
.
SS
= 0 V and V
= 3.0/2.5 V (5/3 V supply). Transition time is measured between V
IH
30 – – 50 – – ns
13 – – 23 – – ns
7––10––ns
3––4––ns
10 – – 17 – – ns
0––0––ns
13 – – 23 – – ns
0––0––ns
13 – – 23 – – ns
0––0––ns
10 – – 17 – – ns
0––0––ns
– – 30 – – 30 ns
Normal-voltage (5 V) specification Low-voltage (3 V) specification
IH
and V
Unit
.
IL
3.0V
0V
CLK
RW
RR
WE
RE
OE
5ns 5ns
t
CK
t
CKW
t
CKW
t
RS
t
RH
t
RS
t
RH
t
t
OEH
OES
2.5V
0V
5ns 5ns
t
RW
t
RR
t
WEH
t
REH
t
WES
t
RES
t
RH
t
RS
t
RH
t
RS
t
WEH
t
t
OEH
t
WES
t
REH
RES
t
OES
DIN
t
t
t
DS
DH
DS
t
DH
NIPPON PRECISION CIRCUITS—4
Output timing
SM5838AS
Parameter Symbol Condition
5 V supply 3 V supply
min typ max min typ max
Access time t
Output hold time t
Output enable delay time
Output disable delay time
1. t
and t
ZO
are measured with ± 200 mV tolerance.
OZ
1
1
A
OH
t
ZO
t
OZ
“Load circuit 1”
“Load circuit 2”
– – 20 – – 40 ns
5––5––ns
5 – 27 5 – 40 ns
5 – 27 5 – 40 ns
Normal-voltage (5 V) specification Low-voltage (3 V) specification
2.0V
0.8V
t
CK
t
CKW
1.8V
1.0V
CLK
t
CKW
t
OEH
t
OES
t
OEH
t
OES
OE
Unit
t
A
DOUT
t
OH
t
OZ
Hi-Z
Load circuit 1 Load circuit 2
VDD
1.8k
Ω
DOUT
Ω
1.1k
30pF
t
A
t
ZO
RR="H" ,RE="L"
DOUT
VDD
1.8k
1.1k
Ω
Ω
5pF
NIPPON PRECISION CIRCUITS—5
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